EXPERIMENTAL STUDIES ON NUCLEATE POOL BOILING HEAT TRANSFER TO ETHANOL/MEG/DEG TERNARY MIXTURE AS A NEW COOLANT
|
|
- Dorcas Ferguson
- 5 years ago
- Views:
Transcription
1 Available on line at Association of the Chemical Engineers of Serbia AChE Chemical Industry & Chemical Engineering Quarterly 8 (4) (202) CI&CEQ M.M. SARAFRAZ S.M. PEYGHAMBARZADEH S.A. ALAVI FAZEL Department of Chemical Engineering, Mahshahr branch, Islamic Azad University, Mahshahr, Iran SCIENTIFIC PAPER UDC :66.8:66.04 DOI /CICEQ6033S EXPERIMENTAL STUDIES ON NUCLEATE POOL BOILING HEAT TRANSFER TO ETHANOL/MEG/DEG TERNARY MIXTURE AS A NEW COOLANT In this paper, nucleate pool boiling heat transfer coefficient of ternary mixtures of ethanol, monoethylene glycol (MEG) and diethylene glycol (DEG) as a new coolant with higher heat transfer coefficient has been investigated. Therefore, at varied concentrations of MEG and DEG and also at different heat fluxes, pool boiling heat transfer coefficients, α, have been experimentally measured. The results demonstrated higher heat transfer coefficient in comparison with water/meg/deg ternary mixture. In particular, at high heat fluxes, for ethanol/meg/deg mixture, higher boiling heat transfer coefficient is reported. Additionally, experimental data were compared to well-known existing correlations. Results of this comparison showed that the most accurate correlation for predicting the heat transfer coefficient of ethanol/meg/deg is the modified Stephan-Preußer correlation, which has been obtained in our earlier work. Keywords: nucleate pool boiling; heat transfer; ethanol; monoethylene glycol; diethylene glycol; ternary mixture. After the publication of our earlier work [], we were determined to test a new ternary mixture as a coolant with higher pool boiling heat transfer coefficient. The existing research studies indicate that understanding the mechanisms of boiling of mixtures and the prediction of their boiling heat transfer coefficient must be studied in depth. Research studies can influence the economic design of heating tools, particularly, estimating heat transfer coefficient at any power cycles or phase changing processes. Also, supplementary studies related to boiling and condensation operations can be considered as key parameters on optimizing and design calculations of heat transfer industries. Nuclear reactors, power plants and electronics packaging are the instances of boiling application in industries [2-4]. The main reason for this fact can be interpreted such that nucleate boiling is capable of transferring large amounts of energy per unit of heat transfer area in comparison to those transferred in forced convection or conduction. This Correspondening author: M.M. Sarafraz, Department of Chemical Engineering, Mahshahr branch, Islamic Azad University, Mahshahr, Iran. mohamadmohsensarafraz@gmail.com Paper received: 6 November, 20 Paper revised: 23 February, 202 Paper accepted: 7 April, 202 undoubtedly is the result of vapor bubbles formation on the heated surface. Experimental investigations on pool boiling of mixtures have shown that the physical processes associated with multi-components boiling are significantly different from those for pure liquids. The basic component of the ternary mixture described in the previous work was water, which was replaced with ethanol in this study. In fact, the main reason of this replacement refers to the lower saturation temperature and mass vaporization of ethanol. In brief, presence of ethanol instead of water, reduce the saturation bulk temperature of mixture and nucleate boiling will occur in lower temperature (around 83 C instead of 00.3 C). Likewise, it is noticeable that MEG and DEG with variety of their concentrations are widely used in anti-freeze and anti-boil water based fluids. Table gives a summary of well-known correlations related to estimating the pool boiling heat transfer coefficient of various hydrocarbon and none-hydrocarbon ternary mixtures []. The correlations have not been experimentally obtained for ternary mixtures, including the MEG/DEG and third part compound, but truly demonstrate treasonable values for pool boiling heat transfer coefficient of other ternary mixtures and can be kept as a reference for comparisons to experimental data. 577
2 Table. Some well-known existing correlations for predicting pool boiling the heat transfer coefficient of binary and ternary mixtures Author Presented correlation Application Ref Palen α [ 0.027( Tbo Tbi )] = e αid kl qd b Pd b ρl ρv cplμl αid = ( )( ) ( ) ( ) ( ) d δμ σ ρ k b L v L N = = α α α Stephan and Preußer d b 2 2 kl q ρv kl μl cpl αstephan 0. = ( ) ( Hfg db / kl ) 0.35 d b k L ρ ( δ d b ) k L T Calus-Rice Schlünder Unal Bajorek et al. Thome id i = α = αid ˆ α y x ( ) DAB α h = + αid Fujita α α = id + K ΔTe / ΔTid Inoue Vinayak-Balakrishnan id n 0 ( T )( ) ( exp ) i sn Tsi yi x = i h ρlδβll B 0 =, β 2 4 / LL = E m s i 0.7 α α = [ ( b b )( b )][ b ] id x.0 y x y.5 b 2 = ( x)ln + x ln + y x B q x for x y 0 y = = =, 0.00 b = 0, b = 52 Pr, b = 0.92 y x Pr ( ψ 2) exp( ψ 2) α h exp id dt = + ( y ) 2 x φ + φ α 2 2 id q dx ξ ξ ξ ξ y 2 x 2 y 2 x 2 φ = D 22 D 2 ξ 2, φ2 = D 22 D 2 ξ y x y x kq ξ kq ξ2 ψ =, ψ 2 = ρλ det[ D] hid le ρλ det[ D] hid le α = αid ΔT bp bq 0 + exp Tid βρ H Δ f g 5, K = 0.75exp( q) q ρ v K = 0.75exp ρvh fg σg ( ρl ρv ) α α = 5, K = 0.75 exp( q) ΔT id e + K Δ T id α D AB = y x α id ˆ α 0.62 Binary [26] Ternary and multi components [3] Binary [24] Ternary and multi components [8] Binary [9] ternary [27] Binary [] Binary, similar to Inoue [4] Binary [20] Binary [5] Similarly to this work, many researchers have studied the pool boiling heat transfer coefficient of ternary mixtures. Several authors proposed that the heat transfer coefficient in the nucleate boiling of ternary mixtures depends strongly on the difference in concentration of the more volatile component between the vapor and the liquid phases [2-5]. Other authors have investigated the influence of the liquid composition and the concentration difference between constituents of a solution on the bubble growth ratio and 578
3 heat transfer mechanism [6-8]. Alavi Fazel et al. [8] demonstrated that pool boiling heat transfer of pure liquids is strongly considered as a function of varied thermophysical properties. They found a new empirical correlation using dimensional analysis method including thermo physical properties such as mass heat of vaporization, surface tension and densities of liquid and vapor phase for determining the pool boiling heat transfer coefficient of pure liquids. Peyghambarzadeh et al. [7,9] experimentally studied the nucleate boiling of binary and ternary mixtures on horizontal cylinder and showed that the Schlunder correlation is the most accurate correlation for estimating the pool boiling heat transfer coefficient of water/mea/dea. They also discussed the impacts of important existing parameters on these correlations like ideal heat transfer coefficient on predicting of heat transfer coefficient. Sarafraz [] investigated the pool boiling heat transfer coefficient of citric acid around the smooth horizontal cylinder and proposed a new modified correlation for estimating the heat transfer coefficient using the thermo physical properties. In this paper, a new ternary compound of ethanol/meg/deg is compared to water/meg/deg (traditional anti-freeze) and for new mixture, a comparison between pool boiling heat transfer coefficients with well-known correlations is carried out. Additionally, the correlation obtained in previous work is examined for the new mixture. Further, the best composition with higher pool boiling heat transfer coefficient is determined based on the thermal toleration of main heater. In simple words, the results of this research demonstrate the enhancement of pool boiling heat transfer coefficient of anti-freezes and anti-boils in pool boiling circumstance via the new coolant mixture (ethanol based) in comparison with traditional (water based) mixtures. EXPERIMENTAL SETUP AND PROCEDURE The complete pool boiling apparatus is shown in Figure. The apparatus consists of a thick-walled cylindrical stainless steel tank containing 38 liters of test liquid and a vertical condenser to condense and recycle the evaporated liquid. The test section is mounted horizontally within the tank and can be observed and photographed through observation glasses at both sides of the tank. The tank and condenser are heavily insulated to reduce heat losses to the ambient air. The temperature in the tank is regulated by an electronic temperature controller and a variable transformer in conjunction with a band heater covering the complete cylindrical outside surface. The pressure in the apparatus is monitored continuously and a pressure relief valve is installed for safety reasons. Boiling occurs at the outside of a cylindrical stainless steel test heater with a diameter of 2 mm, and a heated length of 05 mm. The test heater consists of an internally heated stainless steel sheathed rod and four stainless steel sheathed thermocouples with an Figure. A scheme of experimental apparatus. 579
4 outside diameter of 2 mm are embedded along the circumference of the heater close to the heating surface. Regarding to the type of the heater used in this experiment (rod heater is a cylinder-type heater with super homogenized surface and all the generated heat are radially conducted) and accordingly all the places on the heating surface receives the same heat and therefore any places of heating section has a similar temperature. Moreover, thermocouples as seen in Figure 2 are installed at a depth of 50 mm of cylinder and it shows that heat transfer along the length of the heating section is uniform and furthermore temperature will be constant during the experiment runs. Details of the test heater are given in Figure 2. One thermocouple within the heated section was used as a safety trip to cut off the power if the thermocouple temperature exceeded 70 C. A PCbased data acquisition system was used to measure temperatures, pressure, and heat flux. The power supplied to the test heater could be calculated from the measured current and voltage drop. The average of five readings was used to determine the difference between wall and bulk temperature for each thermocouple. The temperature drop between the location of the wall thermocouples and the heat transfer surface was deducted from the measured temperature difference according to: T T = ( T T ) ( s / k)( q / A) () s b th b In this equation, s is the distance between the thermocouple locations and the heat transfer surface and k is the thermal conductivity of the heater material. The value of s/k was determined for each thermocouple by calibration of the test heater using pure water. The average temperature difference was the arithmetic average of the six thermocouple locations. The heat transfer coefficient h is calculated from: α = q A ( Ts Tb) ave Experimental procedure Initially, the test section and tank were cleaned and the system connected to a vacuum pump. Once the pressure of the system reached approximately 0 kpa, the test solution was introduced. Following this, the tank heater was switched on and the temperature of the system allowed rising. Once the system was de-aerated, it was left at the desired pressure and the corresponding saturation temperature for about five hours to obtain a homogenous condition throughout. Then, the power was supplied to the test heater and kept at a predetermined value. All experiment runs were carried out with decreasing heat flux. Some runs were repeated later to check the reproducibility of the experiments. Uncertainty To measure the uncertainty of experiment, mathematical least square method has been employed. According to heat flux estimating correlation: (2) VL W q " = 2πRL = 2πRL (3) o o Experimental uncertainty is obtained by the following equation: q " q " q " Δ q " = Δ w + Δ r + ΔL w r L (4) Values for Δw, Δr and ΔL are 0, 0.03 and 0.2, respectively. Accordingly, the pool boiling heat transfer coefficient uncertainty, according to the Δq values, is obtained by Eq. (4) as follows: Figure 2. Details and geometry dimensions of heating section. 580
5 2 2 α α Δ α = Δ q " + ΔT q " T (5) In this research, ΔT equals to ±0.2 K according to accuracy of each of thermocouple and Δq equals to.25% according to Eq. (4) and subsequently, uncertainty of estimating of heat transfer coefficient equals to ±2.35%. Physical properties To estimate the thermophysical properties of tested mixtures, some well-known correlations from chemical engineering handbooks have been employed based on their uncertainties. In fact, minimum uncertainties of correlations have been considered. Accordingly, the critical constants have been calculated using the Joback method [2]. The expected uncertainty is reported equal to 7 K ( %) for Tc; 2 bar ( 5%). Liquid density for mixtures has been calculated by Spencer et al. [3] method with the maximum expected uncertainty of 7%. Liquid thermal conductivities for liquids had been predicted by methods summarized by Bruce et al. [4]. The expected uncertainties are reported less than 0% for pure liquids and up to 8% for liquid mixtures. Heat capacities for liquids have been calculated using the Ruziicka and Domalski [5] method, with the expected uncertainty less than 4%. The heat capacities of liquid mixtures are estimated by mole fraction averages of the pure component values. For other key parameters, such as viscosity and surface tension, experimental apparatus were employed. For viscosity, a digital viscometer manufactured by Brookfield and for surface tension, a tension-meter (EW-59780) manufactured by Cole-Parmer were used. The minimum measurement errors of each apparatus were ± and ±2.5% reading, respectively. RESULTS AND DISCUSSIONS The experimental data indicated interesting results for nucleate pool boiling heat transfer coefficient of ethanol/meg/deg mixtures. In fact, a comparison between the water based mixture (water/meg/deg) and ethanol based mixture shows that at the same concentrations of MEG and DEG, higher heat transfer coefficients are reported for ethanol based mixture. Especially, deeply looking at higher heat fluxes indicates that heat transfer coefficient for boiling of ethanol ternary mixture is about 30% higher than water based mixture. In industries, particularly in nuclear reactors and power cycles needing coolants, it is important to transfer huge amounts of heat at high heat fluxes at minimum surface area. Furthermore, a coolant with high and superior heat transfer coefficient is required. As seen, pool boiling heat transfer coefficients for ethanol ternary mixture at higher heat fluxes (even in low and moderate heat fluxes) are dramatically higher. Figures 3 and 4 depict the experimental heat transfer coefficient for different volumetric concentrations of MEG and DEG in ethanol and water, respectively. Figure 3. Experimental pool boiling heat transfer coefficient for ethanol/meg/deg ternary mixture. 58
6 Figure 4. Experimental pool boiling heat transfer coefficient for water/meg/deg ternary (previous work). As clearly seen in Figure 3, regarding the mixture effect, the pool boiling heat transfer coefficient of mixture decreases with increasing MEG and DEG concentrations. In brief, due to the difference in vapor pressures of mixture substances particularly in the vapor /liquid interface, heavier components remain in the interface zone and lighter components due to the higher vapor pressure leave the interface, thus creating a mass transfer between the interface (rich with heavier components) and vapor phase (the least heavier component phase). Therefore, mass transfer acts as a resistance against the heat transfer. However, this phenomenon is not observed in pool boiling of pure substance, because in pure pool boiling the interface is composed of one component, as well as the vapor phase [7-23,25]. On the other hand, regarding the higher heat transfer coefficient of DEG relative to MEG, with increasing DEG concentration, the heat transfer coefficient of mixture significantly increases so that in comparison with similar condition for water/meg/deg, increase of heat transfer coefficient is observed. The best possible values of pool boiling heat transfer coefficient have been recorded at 25% volumetric concentration of MEG and DEG. Noticeably, the main heater does not have enough power to boil the mixture with higher concentration of 25% MEG and 25% DEG, because the boiling points of the tested mixtures are proportional to concentrations of MEG and DEG. Therefore, 25% of MEG and 25% of DEG are kept as bounds of concentration. On the other hand, owing to the higher prices of MEG and DEG in comparison with water and ethanol, it is more economical to use 25% of MEG and DEG. Figure 5 shows the comparison between water based and ethanol based mixtures and their pool boiling heat transfer coefficients simultaneously. A rough comparison between pool boiling heat transfer coefficient of pure water and pure ethanol helps understanding the positive influence of ethanol in enhancing the heat transfer coefficient. This comparison demonstrates that mostly, at any low, moderate and high heat fluxes, pure ethanol has a lower pool boiling heat transfer coefficient compared to pure water. However, in terms of thermophysical properties of ethanol, particularly due to lower and vapor pressure and mass heat of vaporization of ethanol relative to water (853.9 vs kj kg -, respectively) [40], in ethanol/meg/deg mixtures ethanol vaporizes faster (compared to pure water in water/meg/deg). Therefore, the more significant mass transfer mechanism appears inside the liquid mixture phase between vapor in bubbles and liquid phase, and also at the interface of liquid/vapor phase. Subsequently, the boiling phenomenon will be controlled with heat and more mass transfer mechanism compared to boiling of water/meg/deg mixture. Figure 6 shows the comparison of pure water and ethanol at similar conditions for low, moderate and high heat fluxes. To check the validity of experimentally measured data, some existing correlations have been compared to experimental data. In particular, the correlation results obtained in the previous work were 582
7 Figure 5. Comparison between ethanol-based and water-based heat transfer coefficient for MEG25%-DEG25% at the best composition condition. Figure 6. Comparison of pool boiling heat transfer for pure water and pure ethanol. examined. As expected, among the existing correlations, the Sarafraz et al. [] modified correlation was the most accurate correlation for glycol mixtures. The absolute average deviations of predicted values in comparison to experimental data for Palen [26], Stephan et al. [4] and Bajorek [27] are given in Table 2. For estimating the heat transfer coefficient at ideal conditions, the Stephan-Abdelsalam correlation [42] was employed. Figure 7 shows the results of comparing the experimental data with the predicted values of existing correlations. Table 2 represents the absolute average deviation for existing correlations. A.A.D% is obtained using Eq. (6): hexp h Calc AAD.. % = 00 (6) n h Exp 583
8 Table 2. Absolute average deviation of existing correlations in comparison to experimental data Correlation Palen Bajorek Stephan et al. Sarafraz et al. A.A.D% 38.4% 27.36% 4.54% 7.8% Figure 7. Comparisons between existing correlations and experimental data. CONCLUSION Experimental studies on nucleate pool boiling heat transfer of ethanol/meg/deg were performed at different concentrations of MEG and DEG and at various heat fluxes up to 4 kw m 2. In our previous work, ternary mixture of water/meg/deg was investigated however, in this work, comparison between pool boiling heat transfer coefficient of ethanol/deg/ /MEG and water/meg/deg was done. The comparison results indicated that, at the best condition of ethanol/meg/deg composition, in which volumetric concentrations of MEG and DEG are equal to 25%, the highest pool boiling heat transfer coefficients were recorded. It was shown that, at any flux, the ethanol based mixture has higher heat transfer coefficient compared to the water based mixture and the maximum enhancement is reported for 25% MEG-25% DEG which is about 30% relative to water based ternary mixture. Likewise, comparison with existing correlations demonstrated that the Sarafraz et al. modified correlation was the most accurate correlation among the other examined correlations with a deviation of 7.8%. Nomenclature A Area, m 2 B 0 Ratio of the interfacial area of heat transfer to the interfacial area of mass transfer b -b 5 See Unal equation C Heat capacity, J kg - K - D AB Diffusivity coefficient, m 2 s - d b Bubble departing diameter, m g Gravitational acceleration, m s -2 H fg Mass heat of vaporization, J kg - K Thermal conductivity, W m - K - N Number of components P Pressure, Pa q Heat, J (Watt) q Heat Flux, W m -2 R a Roughness, m o r Cylinder outer diameter, m s Distance, m T Temperature, K W Power, W x Liquid mass or mole fraction y Vapor mass or mole fraction. Subscripts b Bulk c Critical i Component id Ideal l Liquid o Reference 584
9 r s th v Reduced Saturated or surface Thermocouples Vapor. Greek symbols α Heat transfer coefficient, W m -2 K - ˆα Thermal diffusion, m 2 s - β Mass transfer coefficient, m s - Δ Difference ρ Density, kg m -3 σ Surface tension, Dy/cm or somewhere N m -. REFERENCES [] M.M. Sarafraz, S.A. Alavi Fazel, Y. Hasanzadeh, A. Arabi Shamsabadi, S. Bahram, 20, DOI: / /CICEQ062504S [2] E. Hahne, U. Grigull, Heat Transfer in Boiling, Hemisphere Publishing Corporation, 977 [3] Y. Fujita, Q. Bai, Int. J. Refrig. 20(8) (997) [4] K. Stephan, M. Körner, Chem. Ing. Technol. (969) [5] J.R. Thome, G. Davey, Int. J. Heat Mass Transfer 24 (98) [6] H.E. Alpay, F. Balkan, Int. J. Heat Mass Transfer 32 (989) [7] S.M. Peyghambarzadeh, M. Jamialahmadi, S.A. Alavi Fazel, S. Azizi, Braz. J. Chem. Eng. 26 (2009) [8] S.A Alavi Fazel, S. Roumana, Pool boiling heat transfer to pure liquids, WSEAS Conference, USA, 200 [9] S.M. Peyghambarzadeh, M.Jamialahmadi, S.A. Alavi Fazel, S. Azizi, Exp. Therm. Fluid. Sci. 33 (2009) [0] M.M. Sarafraz, Heat Mass Trans. 40 (20) -9 [] K.G. Joback, M.S. Thesis in Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MS, 984 [2] C.F. Spencer, R.P. Danner, J. Chem. Eng. Data 7 (972) [3] E. Bruce, J. Poling, J.M. Prausnitz, P. O Connell, The properties of gases and liquids, 5 th ed., The McGraw-Hill Companies, New York, 2004 [4] V. Ruzicka, E. S. Domalski, J. Phys. Chem. Ref. Data 22 (993) [5] W.R. McGillis, J.S. Fitch, W.R. Hamburgen, V.P. Carey, Boiling binary mixtures at subatmospheric pressures, Technical Note TN-23, Western Research Laboratory, Palo Alto, CA, USA, 992 [6] M. Jamialahmadi, A. Helalizadeh, H. Muller-Steinhagen, Int. J. Heat Mass Tran. 47 (2004) [7] E. Hahne, U. Grigull (eds.), Heat transfer in boiling, Hemisphere Publ. Corp., Washington, USA, 977 [8] Y. Fujita, Q. Bai, Int. J. Refrig. 20(8) (997) [9] K. Stephan, M. Korner, Chem. Ing. Technol. 4 (969) [20] J.R. Thome, G. Davey, Int. J. Heat Mass Tran 24 (98) [2] H.E. Alpay, F. Balkan, Int. J. Heat Mass Tran. 32 (989) [22] D. Jung, K. Song, K. Ahn, J. Kim, Int. J. Refrig. 26 (2003) [23] Y. Fujita, M. Tsutsui, Int. J. Heat Mass Tran 47 (2004) [24] G. Vinayak Rao, A.R. Balakrishnan, Exp. Therm. Fluid Sci. 29 (2004) [25] L.D. Boyko, G.N. Kruzhilin, Int. J. Heat Mass Tran 0 (967) [26] I.L. Mostinski, Teploenergetika 4 (963) 66-7 [27] E.U. Schlünder, Int. Chem. Eng. 23 (4) (983) [28] H. Jungnickel, P. Wassilew, W.E. Kraus, Int. J. Refrig. 3 (980) [29] T. Inoue, M. Monde, Y. Teruya, Int. J. Heat Mass Tran 45 (2002) [30] J.R. Thome, S. Shakir, AIChE Symp. Ser. 83 (987) 46-5 [3] Y. Fujita, M. Tsutsui, Int. J. Heat Mass Tran 37 (994) [32] B. Xiao, B. Yu, Int. J. Therm. Sci. 46 (2007) [33] W.F. Calus, P. Rice, Chem. Eng. Sci. 27 (972) [34] H.C. Unal, Int. J. Heat Mass Tran 29 (986) [35] J.W. Palen, W. Small, Hydrocarb. Process. 3 (964) [36] S.M. Bajorek, J.R. Lioyd, J.R. Thome, AIChE Symp Ser. 85 (989) [37] K.G. Joback, M.Sc. Thesis, Massachusetts Institute of Technology, Cambridge, MA,. 984 [38] C.F. Spencer, R.P. Danner, J. Chem. Eng. Data 7 (972) 236 [39] B.E. Poling, G.H. Thomson, D.G. Friend, R.L. Rowley, W.V. Wilding, Perry s chemical engineers handbook, 8 th ed., McGraw Hill, New York, 2008, p. 53 [40] K. Stephan, P. Preusser, Ger. Chem. Eng. 2 (979) 6 69 [4] K. Stephan, K. Abdelsalam, Int. J. Heat and Mass Trans. 23 (980),
10 M.M. SARAFRAZ S.M. PEYGHAMBARZADEH S.A. ALAVI FAZEL Department of Chemical Engineering, Mahshahr branch, Islamic Azad University, Mahshahr, Iran NAUČNI RAD EKSPERIMENTALNO ISPITIVANJE PRENOSA TOPLOTE PRI NUKLEATSKOM KLJUČANJU ZASIĆENE TERNERNE SMEŠE ETANOL/MEG/DEG KAO RASHLADNE TEČNOSTI U ovom radu ispitivan je koeficijent prenosa toplote pri nukleatskom ključanju ternernih smeša etanola, monoetilen-glikola (MEG) i dietilen-glikola (DEG) kao nove rashladne tečnosti. Pri različitim koncentracijama MEG I DEG, kao i različitim toplotnim fluksevima, koeficijent prenosa toplote je određivan eksperimentalno. Rezultati su pokazali veće vrednosti koeficijenta prenosa toplote u poređenju sa trokomponentnim smešama voda/meg/deg. Naročito pri velikim toplotnim fluksevima, određene su veće vrednosti koeficijenta prenosa toplote. Pored toga, eksperimentalni podaci su poređeni sa dobro poznatim korelacijama. Ovo poređenje je pokazalo da je modifikovana Stefan-Projserova korelacija, koja je dobijena ranijim istraživanjima, najpreciznija u predviđanju koeficijenta prenosa toplote za system etanol/meg/deg. Ključne reči: nukleatsko ključanje; prenos toplote; etanol; monoetilen-glikol; dietilen-glikol; trokomponentna smeša. 586
DEVELOPMENT OF A NEW CORRELATION FOR ESTIMATING POOL BOILING HEAT TRANSFER COEFFICIENT OF MEG/DEG/WATER TERNARY MIXTURE
Aailable on line at Association of the Chemical Engineers of Serbia AChE www.ache.org.rs/ciceq Chemical Industry & Chemical Engineering Quarterly 8 () 8 (0) CI&CEQ M.M. SARAFRAZ S.A. ALAVI FAZEL Y. HASANZADEH
More informationPool Boiling Heat Transfer to Pure Liquids
Pool Boiling Heat Transfer to Pure Liquids S. A. ALAVI FAZEL, S. ROUMANA Chemical Engineering Department Islamic Azad University, Mahshahr branch Mahshahr, Khuzestan province IRAN alavifazel@gmail.com
More informationEXPERIMENTAL AND THEORETICAL STUDY OF POOL BOILING HEAT TRANSFER TO AMINE SOLUTIONS
Brazilian Journal of Chemical Engineering ISSN 0104-6632 Printed in Brazil www.abeq.org.br/bjche Vol. 26, No. 01, pp. 33-43, January - March, 2009 EXPERIMENTAL AND THEORETICAL STUDY OF POOL BOILING HEAT
More informationA Generalized Correlation for Pool Boiling Heat Transfer Coefficient Based on Corresponding State Rule for Pure Compounds and Binary Mixtures
A Generalized Correlation for Pool Boiling Heat Transfer Coefficient Based on Corresponding State Rule for Pure Compounds and Binary Mixtures HASAN QABAZARD and MAHMOOD MOSHFEGHIAN 1 Petroleum Research
More informationChapter 10: Boiling and Condensation 1. Based on lecture by Yoav Peles, Mech. Aero. Nuc. Eng., RPI.
Chapter 10: Boiling and Condensation 1 1 Based on lecture by Yoav Peles, Mech. Aero. Nuc. Eng., RPI. Objectives When you finish studying this chapter, you should be able to: Differentiate between evaporation
More informationA generalized correlation of nucleate pool boiling of liquids
Indian Journal of Chemical Technology Vol. 11, September 2004, pp. 719-725 A generalized correlation of nucleate pool boiling of liquids S Bhaumik a, V K Agarwal b & S C Gupta b* a Mechanical Engineering
More informationCFD SIMULATIONS OF FLOW, HEAT AND MASS TRANSFER IN THIN-FILM EVAPORATOR
Distillation Absorption 2010 A.B. de Haan, H. Kooijman and A. Górak (Editors) All rights reserved by authors as per DA2010 copyright notice CFD SIMULATIONS OF FLOW, HEAT AND MASS TRANSFER IN THIN-FILM
More informationCALCULATION AND EXPERIMENTAL VERIFICATION OF HEAT TRANSFER COEFFICIENT FOR LOW PRESSURE METHANOL EVAPORATOR
CALCULATION AND EXPERIMENTAL VERIFICATION OF HEAT TRANSFER COEFFICIENT FOR LOW PRESSURE METHANOL EVAPORATOR Tomasz HAŁON (*), Bartosz ZAJĄCZKOWSKI (*), Zbigniew KRÓLICKI (*), Karolina WOJTASIK (*) (*)
More informationSUBCOOLED FLOW BOILING HEAT TRANSFER OF ETHANOL AQUEOUS SOLUTIONS IN VERTICAL ANNULUS SPACE
Available on line at Association of the Chemical Engineers of Serbia AChE www.ache.org.rs/ciceq Chemical Industry & Chemical Engineering Quarterly 18 (2) 315 327 (2012) CI&CEQ M.M. SARAFRAZ 1 S.M. PEYGHAMBARZADEH
More informationBoiling Heat Transfer and Pressure Drop of R1234ze(E) inside a Small-Diameter 2.5 mm Microfin Tube
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 208 Boiling Heat Transfer and Pressure Drop of inside a Small-Diameter 2.5 mm
More informationNucleate pool boiling heat transfer from small horizontal smooth tube bundles
TRANSACTIONS OF THE INSTITUTE OF FLUID-FLOW MACHINERY No. 123, 2011, 85 98 KRZYSZTOF KRASOWSKI 1 and JANUSZ T. CIEŚLIŃSKI 2 Nucleate pool boiling heat transfer from small horizontal smooth tube bundles
More informationheat transfer process where a liquid undergoes a phase change into a vapor (gas)
Two-Phase: Overview Two-Phase two-phase heat transfer describes phenomena where a change of phase (liquid/gas) occurs during and/or due to the heat transfer process two-phase heat transfer generally considers
More informationIHTC DRAFT MEASUREMENT OF LIQUID FILM THICKNESS IN MICRO TUBE ANNULAR FLOW
DRAFT Proceedings of the 14 th International Heat Transfer Conference IHTC14 August 8-13, 2010, Washington D.C., USA IHTC14-23176 MEASUREMENT OF LIQUID FILM THICKNESS IN MICRO TUBE ANNULAR FLOW Hiroshi
More informationForced Convection Heat Transfer in the Entrance Region of Horizontal Tube under Constant Heat Flux
World Applied Sciences Journal 15 (3): 331-338, 011 ISSN 1818-495 IDOSI Publications, 011 Forced Convection Heat Transfer in the Entrance Region of Horizontal Tube under Constant Heat Flux S.M. Peyghambarzadeh
More informationFLOW BOILING HEAT-TRANSFER IN PLATE MICRO- CHANNEL HEAT SINK
International J. of Math. Sci. & Engg. Appls. (IJMSEA) ISSN 0973-9424, Vol. 10 No. I (April, 2016), pp. 257-265 FLOW BOILING HEAT-TRANSFER IN PLATE MICRO- CHANNEL HEAT SINK R. S. H. AL-KHAFAJY College
More informationEvaporation of nanofluid droplet on heated surface
Research Article Evaporation of nanofluid droplet on heated surface Advances in Mechanical Engineering 1 8 Ó The Author(s) 2015 DOI: 10.1177/1687814015578358 aime.sagepub.com Yeung Chan Kim Abstract In
More informationEvaporation Heat Transfer Coefficients Of R-446A And R-1234ze(E)
Proceedings of the 2 nd World Congress on Mechanical, Chemical, and Material Engineering (MCM'16) Budapest, Hungary August 22 23, 2016 Paper No. HTFF 144 DOI: 10.11159/htff16.144 Evaporation Heat Transfer
More informationAn experimental investigation of the thermal performance of an asymmetrical at plate heat pipe
International Journal of Heat and Mass Transfer 43 (2000) 2657±2668 www.elsevier.com/locate/ijhmt An experimental investigation of the thermal performance of an asymmetrical at plate heat pipe Y. Wang,
More informationPROBLEM h fg ρ v ρ l σ 10 3 T sat (kj/kg) (kg/m 3 ) (N/m) (K)
PROBLEM 10.9 KNOWN: Fluids at 1 atm: mercury, ethanol, R-1. FIND: Critical heat flux; compare with value for water also at 1 atm. ASSUMPTIONS: (1) Steady-state conditions, () Nucleate pool boiling. PROPERTIES:
More informationTheoretical and Experimental Studies on Transient Heat Transfer for Forced Convection Flow of Helium Gas over a Horizontal Cylinder
326 Theoretical and Experimental Studies on Transient Heat Transfer for Forced Convection Flow of Helium Gas over a Horizontal Cylinder Qiusheng LIU, Katsuya FUKUDA and Zheng ZHANG Forced convection transient
More informationOnset of Flow Instability in a Rectangular Channel Under Transversely Uniform and Non-uniform Heating
Onset of Flow Instability in a Rectangular Channel Under Transversely Uniform and Non-uniform Heating Omar S. Al-Yahia, Taewoo Kim, Daeseong Jo School of Mechanical Engineering, Kyungpook National University
More informationAN EXPERIMENTAL INVESTIGATION OF BOILING HEAT CONVECTION WITH RADIAL FLOW IN A FRACTURE
PROCEEDINGS, Twenty-Fourth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 25-27, 1999 SGP-TR-162 AN EXPERIMENTAL INVESTIGATION OF BOILING HEAT CONVECTION
More informationPROBLEM ρ v (kg/m 3 ) ANALYSIS: The critical heat flux can be estimated by Eq with C = 0.
PROBLEM 10.10 KNOWN: Fluids at 1 atm: mercury, ethanol, R-14a. FIND: Critical heat flux; compare with value for water also at 1 atm. ASSUMPTIONS: (1) Steady-state conditions, () Nucleate pool boiling.
More informationEffect of Nanofluid Concentration on the Performance of Circular Heat Pipe
International Journal of Scientific & Engineering Research Volume 2, Issue 4, April-2011 1 Effect of Nanofluid Concentration on the Performance of Circular Heat Pipe M. G. Mousa Abstract The goal of this
More informationCONVECTIVE HEAT TRANSFER OF BINARY MIXTURES UNDER FLOW BOILING CONDITIONS. E. V. McAssey Jr., Villanova University, Villanova, PA USA
CONVECTIVE HEAT TRANSFER OF BINARY MIXTURES UNDER FW BOILING CONDITIONS E. V. McAssey Jr., Villanova University, Villanova, PA USA S. G. Kandlikar Rochester Institute of Technology, Rochester, NY USA Abstract
More informationSpecific Heat Measurement of High Temperature Thermal Insulations by Drop Calorimeter Method
International Journal of Thermophysics, Vol 24, No 2, March 23 ( 23) Specific Heat Measurement of High Temperature Thermal Insulations by Drop Calorimeter Method T Ohmura, 1,2 M Tsuboi, 1 M Onodera, 1
More informationNatural convection heat transfer around a horizontal circular cylinder near an isothermal vertical wall
Natural convection heat transfer around a horizontal circular cylinder near an isothermal vertical wall Marcel Novomestský 1, Richard Lenhard 1, and Ján Siažik 1 1 University of Žilina, Faculty of Mechanical
More informationANALYSIS ON THERMAL AND HYDRAULIC PERFORMANCE OF A T-SHAPED VAPOR CHAMBER DESIGNED FOR MOTORCYCLE LED LIGHTS
THERMAL SCIENCE: Year 2019, Vol. 23, No. 1, pp. 137-148 137 ANALYSIS ON THERMAL AND HYDRAULIC PERFORMANCE OF A T-SHAPED VAPOR CHAMBER DESIGNED FOR MOTORCYCLE LED LIGHTS by Qifei JIAN a*, Cong LI a, and
More informationHeat processes. Heat exchange
Heat processes Heat exchange Heat energy transported across a surface from higher temperature side to lower temperature side; it is a macroscopic measure of transported energies of molecular motions Temperature
More informationComparison of pool boiling heat transfer for different tunnel-pore surfaces
EPJ Web of Conferences, 9 () DOI:./ epjconf/9 C Owned by the authors, published by EDP Sciences, Comparison of pool boiling heat transfer for different nel-pore surfaces Robert Pastuszko,a Kielce University
More informationHeriot-Watt University
Heriot-Watt University Heriot-Watt University Research Gateway Shell-side boiling of a glycerol-water mixture at low sub-atmospheric pressures McNeil, David Archibald; Burnside, Bryce; Elsaye, Elsaye Abdulhafiz;
More informationAPPLICATION AND TESTING OF A NEW SIMPLE EXPERIMENTAL SET-UP FOR THERMAL CONDUCTIVITY MEASUREMENTS OF LIQUIDS
THERMAL SCIENCE: Year 2017, Vol. 21, No. 3, pp. 1195-1202 1195 APPLICATION AND TESTING OF A NEW SIMPLE EXPERIMENTAL SET-UP FOR THERMAL CONDUCTIVITY MEASUREMENTS OF LIQUIDS by Andrej M. STANIMIROVIĆ a*,
More informationEffect of Coiled Capillary Tube Pitch on Vapor Compression Refrigeration System Performance.
Effect of Coiled Capillary Tube Pitch on Vapor Compression Refrigeration System Performance. M.A. Akintunde, Ph.D. Federal University of Technology, Department of Mechanical Engineering PMB 74, Akure,
More informationUniversity of Rome Tor Vergata
University of Rome Tor Vergata Faculty of Engineering Department of Industrial Engineering THERMODYNAMIC AND HEAT TRANSFER HEAT TRANSFER dr. G. Bovesecchi gianluigi.bovesecchi@gmail.com 06-7259-727 (7249)
More informationELEC9712 High Voltage Systems. 1.2 Heat transfer from electrical equipment
ELEC9712 High Voltage Systems 1.2 Heat transfer from electrical equipment The basic equation governing heat transfer in an item of electrical equipment is the following incremental balance equation, with
More informationFLOW BOILING OF ETHANOL IN SMALL DIAMETER TUBES
8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics HEFAT211 8 th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics 11 July 13 July 211 Pointe
More informationThe Research of Heat Transfer Area for 55/19 Steam Generator
Journal of Power and Energy Engineering, 205, 3, 47-422 Published Online April 205 in SciRes. http://www.scirp.org/journal/jpee http://dx.doi.org/0.4236/jpee.205.34056 The Research of Heat Transfer Area
More informationNucleate boiling heat transfer coefficients of halogenated refrigerants up to critical heat fluxes
Nucleate boiling heat transfer coefficients of halogenated refrigerants up to critical heat fluxes K-J Park 1, D Jung 1, and SEShim 2 1 Department of Mechanical Engineering, Inha University, Incheon, Republic
More informationInvestigation of Packing Effect on Mass Transfer Coefficient in a Single Drop Liquid Extraction Column
Iranian Journal of Chemical Engineering Vol. 7, No. 4 (Autumn), 2010, IAChE Investigation of Packing Effect on Mass Transfer Coefficient Z. Azizi, A. Rahbar, H. Bahmanyar Engineering College, Chemical
More informationHEAT TRANSFER CAPABILITY OF A THERMOSYPHON HEAT TRANSPORT DEVICE WITH EXPERIMENTAL AND CFD STUDIES
HEAT TRANSFER CAPABILITY OF A THERMOSYPHON HEAT TRANSPORT DEVICE WITH EXPERIMENTAL AND CFD STUDIES B.M. Lingade a*, Elizabeth Raju b, A Borgohain a, N.K. Maheshwari a, P.K.Vijayan a a Reactor Engineering
More informationMECHANISM OF GAS-LIQUID EXCHANGE IN MICROBUBBLE EMISSION BOILING
MECHANISM OF GAS-LIQUID EXCHANGE IN MICROBUBBLE EMISSION BOILING *T. Furusho, K. Yuki, R. Kibushi, N. Unno and K. Suzuki 2 Tokyo University of Science-Yamaguchi, Daigaku-dori --, Sanyo-Onoda, Yamaguchi,
More informationExperimental Investigation of Pool Boiling Enhancement on Different Structured Surfaces
Experimental Investigation of Pool Boiling Enhancement on Different Structured Surfaces D L Bankar 1, S S Kale 2 1M. E., Dept. of Mechanical Engineering, N K Orchid College of Engg. & Tech., Solapur, Maharashtra,
More informationHandout 10: Heat and heat transfer. Heat capacity
1 Handout 10: Heat and heat transfer Heat capacity Consider an experiment in Figure 1. Heater is inserted into a solid substance of mass m and the temperature rise T degrees Celsius is measured by a thermometer.
More informationStudies on flow through and around a porous permeable sphere: II. Heat Transfer
Studies on flow through and around a porous permeable sphere: II. Heat Transfer A. K. Jain and S. Basu 1 Department of Chemical Engineering Indian Institute of Technology Delhi New Delhi 110016, India
More informationInterPACKICNMM
Proceedings of the ASME 215 International Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems and ASME 215 International Conference on Nanochannels, Microchannels,
More informationThe Effect of Nozzle Height on Cooling Heat Transfer from a Hot Steel Plate by an Impinging Liquid Jet
, pp. 704 709 The Effect of Nozzle Height on Cooling Heat Transfer from a Hot Steel Plate by an Impinging Liquid Jet Piljong LEE, Haewon CHOI 1) and Sunghong LEE 2) Technical Research Center, POSCO, Pohang
More informationAnalysis and Steps to Mitigate Heat Exchanger Fouling in an Aromatics Plant
Refereed Proceedings Heat Exchanger Fouling and Cleaning: Fundamentals and Applications Engineering Conferences International Year Analysis and Steps to Mitigate Heat Exchanger Fouling in an Aromatics
More informationA Rotating Disc Study on Silver Dissolution in Concentrate HNO 3 Solutions
C. ÖZMETIN, A Rotating Disc Study on Silver Dissolution in Concentrate HNO 3 Solutions, Chem. Biochem. Eng. Q. 17 (2) 165 169 (2003) 165 A Rotating Disc Study on Silver Dissolution in Concentrate HNO 3
More informationHeat Transfer of Refrigerant Mixtures
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 1992 Heat Transfer of Refrigerant Mixtures D. B. Bivens Du Pont Company Fluorochemicals
More informationHeat Transfer Correlations for Small Closed End Heat Pipe with Special Vapor Chamber
Original Article Heat Transfer Correlations for Small Closed End Heat Pipe with Special Vapor Chamber Duangkamon Hemathurin 1, Narong Srihajong 1, Paisan Kumthong 1, Juthamat Silon 1 Received: 12 June
More informationKi-Sub Kim, Jong-Won Lee, Jin-Soo Kim and Huen Lee
Korean J. Chem. Eng., 20(4), 762-767 (2003) Heat Capacity Measurement and Cycle Simulation of the Trifluoroethanol (TFE) +Quinoline Mixture as a New Organic Working Fluid Used in Absorption Heat Pump Ki-Sub
More informationChapter 1 INTRODUCTION AND BASIC CONCEPTS
Heat and Mass Transfer: Fundamentals & Applications 5th Edition in SI Units Yunus A. Çengel, Afshin J. Ghajar McGraw-Hill, 2015 Chapter 1 INTRODUCTION AND BASIC CONCEPTS Mehmet Kanoglu University of Gaziantep
More informationInternational Journal of Heat and Mass Transfer
International Journal of Heat and Mass Transfer 52 (2009) 4519 4524 Contents lists available at ScienceDirect International Journal of Heat and Mass Transfer journal homepage: www.elsevier.com/locate/ijhmt
More informationBOILING AND CONDENSATION HEAT TRANSFER COEFFICIENTS FOR A HEAT PIPE HEAT EXCHANGER
Frontiers in Heat Pipes Available at www.thermalfluidscentral.org BOILING AND CONDENSATION HEAT TRANSFER COEFFICIENTS FOR A HEAT PIPE HEAT EXCHANGER R. Laubscher, R.T. Dobson * Department of Mechanical
More informationNon-Newtonian fluids is the fluids in which shear stress is not directly proportional to deformation rate, such as toothpaste,
CHAPTER1: Basic Definitions, Zeroth, First, and Second Laws of Thermodynamics 1.1. Definitions What does thermodynamic mean? It is a Greeks word which means a motion of the heat. Water is a liquid substance
More informationAxial profiles of heat transfer coefficients in a liquid film evaporator
Axial profiles of heat transfer coefficients in a liquid film evaporator Pavel Timár, Ján Stopka, Vladimír Báleš Department of Chemical and Biochemical Engineering, Faculty of Chemical and Food Technology,
More informationPrinciples of Food and Bioprocess Engineering (FS 231) Problems on Heat Transfer
Principles of Food and Bioprocess Engineering (FS 1) Problems on Heat Transfer 1. What is the thermal conductivity of a material 8 cm thick if the temperature at one end of the product is 0 C and the temperature
More informationCHAPTER 5 CONVECTIVE HEAT TRANSFER COEFFICIENT
62 CHAPTER 5 CONVECTIVE HEAT TRANSFER COEFFICIENT 5.1 INTRODUCTION The primary objective of this work is to investigate the convective heat transfer characteristics of silver/water nanofluid. In order
More informationConvective Mass Transfer
Convective Mass Transfer Definition of convective mass transfer: The transport of material between a boundary surface and a moving fluid or between two immiscible moving fluids separated by a mobile interface
More informationNATURAL CONVECTION HEAT TRANSFER CHARACTERISTICS OF KUR FUEL ASSEMBLY DURING LOSS OF COOLANT ACCIDENT
NATURAL CONVECTION HEAT TRANSFER CHARACTERISTICS OF KUR FUEL ASSEMBLY DURING LOSS OF COOLANT ACCIDENT Ito D*, and Saito Y Research Reactor Institute Kyoto University 2-1010 Asashiro-nishi, Kumatori, Sennan,
More informationThermodynamics I. Properties of Pure Substances
Thermodynamics I Properties of Pure Substances Dr.-Eng. Zayed Al-Hamamre 1 Content Pure substance Phases of a pure substance Phase-change processes of pure substances o Compressed liquid, Saturated liquid,
More informationBoiling and Condensation (ME742)
Indian Institute of Technology Kanpur Department of Mechanical Engineering Boiling and Condensation (ME742) PG/Open Elective Credits: 3-0-0-9 Updated Syllabus: Introduction: Applications of boiling and
More informationCharacteristics of Flow Boiling Heat Transfer of Sub-Critical CO2 in Mini-Channels With Micro- Fins
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 2008 Characteristics of Flow Boiling Heat Transfer of Sub-Critical CO2 in Mini-Channels
More informationREVIEW AND SYNTHESIS: CHAPTERS 13 15
REVIEW AND SYNTHESIS: CHAPTERS 13 15 Review Exercises 1. Strategy Assume no heat is lost to the air. The potential energy of the water is converted into heating of the water. The internal energy of the
More informationApplication of the Multi-current Transient Hot-Wire Technique for Absolute Measurements of the Thermal Conductivity of Glycols
International Journal of Thermophysics, Vol. 26, No. 3, May 2005 ( 2005) DOI: 10.1007/s10765-005-5568-4 Application of the Multi-current Transient Hot-Wire Technique for Absolute Measurements of the Thermal
More informationInvestigation of CTF void fraction prediction by ENTEK BM experiment data
Investigation of CTF void fraction prediction by ENTEK BM experiment data Abstract Hoang Minh Giang 1, Hoang Tan Hung 1, Nguyen Phu Khanh 2 1 Nuclear Safety Center, Institute for Nuclear Science and Technology
More informationMEASUREMENTS OF ISOBARIC HEAT CAPACITY OF LIQUID PENTAFLUOROETHANE (R125)
MEASUREMENTS OF ISOBARIC HEAT CAPACITY OF LIQUID PENTAFLUOROETHANE (R15) Xiang ZHAO, Shigehiro MATSUEDA, and Haruki SATO Faculty of Science and Technology Keio University 3-14-1, Hiyoshi, Kohoku-ku Yokohama
More informationHeat Transfer of Condensation in Smooth Round Tube from Superheated Vapor
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 2016 Heat Transfer of Condensation in Smooth Round Tube from Superheated Vapor
More informationEXPERIMENTAL ANALYSIS OF R-134a FLOW CONDENSATION IN A SMOOTH TUBE
HEFAT2012 9 th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics 16 18 July 2012 Malta EXPERIMENTAL ANALYSIS OF R-134a FLOW CONDENSATION IN A SMOOTH TUBE Bastos S., Fernández-Seara
More informationExperimental investigation on up-flow boiling of R1234yf in aluminum multi-port extruded tubes
Purdue University Purdue e-pubs International Refrigeration and Air Conditioning Conference School of Mechanical Engineering 2016 Experimental investigation on up-flow boiling of R1234yf in aluminum multi-port
More informationIf there is convective heat transfer from outer surface to fluid maintained at T W.
Heat Transfer 1. What are the different modes of heat transfer? Explain with examples. 2. State Fourier s Law of heat conduction? Write some of their applications. 3. State the effect of variation of temperature
More informationHeat Transfer Predictions for Carbon Dioxide in Boiling Through Fundamental Modelling Implementing a Combination of Nusselt Number Correlations
Heat Transfer Predictions for Carbon Dioxide in Boiling Through Fundamental Modelling Implementing a Combination of Nusselt Number Correlations L. Makaum, P.v.Z. Venter and M. van Eldik Abstract Refrigerants
More informationChapter 3 PROPERTIES OF PURE SUBSTANCES. Thermodynamics: An Engineering Approach, 6 th Edition Yunus A. Cengel, Michael A. Boles McGraw-Hill, 2008
Chapter 3 PROPERTIES OF PURE SUBSTANCES Thermodynamics: An Engineering Approach, 6 th Edition Yunus A. Cengel, Michael A. Boles McGraw-Hill, 2008 Objectives Introduce the concept of a pure substance. Discuss
More informationPart 1 Principles of the Fluid Dynamic Design of Packed Columns for Gas/Liquid Systems
Part 1 Principles of the Fluid Dynamic Design of Packed Columns for Gas/Liquid Systems List of Symbols for Part 1 Formula Variables, Latin Letters a m 2 m 3 geometric surface area of packing per unit volume
More informationMOLECULAR DYNAMICS SIMULATION OF HETEROGENEOUS NUCLEATION OF LIQUID DROPLET ON SOLID SURFACE
MOLECULAR DYNAMICS SIMULATION OF HETEROGENEOUS NUCLEATION OF LIQUID DROPLET ON SOLID SURFACE Tatsuto Kimura* and Shigeo Maruyama** *Department of Mechanical Engineering, The University of Tokyo 7-- Hongo,
More informationME 331 Homework Assignment #6
ME 33 Homework Assignment #6 Problem Statement: ater at 30 o C flows through a long.85 cm diameter tube at a mass flow rate of 0.020 kg/s. Find: The mean velocity (u m ), maximum velocity (u MAX ), and
More informationAlexandre Guion. Advances in boiling simulations using interface tracking methods and microscale modeling
Advances in boiling simulations using interface tracking methods and microscale modeling Alexandre Guion Prof. J. Buongiorno Prof. N. Todreas Prof. E. Baglietto Prof. S. Zaleski Massachusetts Institute
More informationNUMERICAL INVESTIGATION OF THERMOCAPILLARY INDUCED MOTION OF A LIQUID SLUG IN A CAPILLARY TUBE
Proceedings of the Asian Conference on Thermal Sciences 2017, 1st ACTS March 26-30, 2017, Jeju Island, Korea ACTS-P00786 NUMERICAL INVESTIGATION OF THERMOCAPILLARY INDUCED MOTION OF A LIQUID SLUG IN A
More informationMeasurement of the performances of a transparent closed loop two-phase thermosyphon
Advanced Computational Methods and Experiments in Heat Transfer XI 227 Measurement of the performances of a transparent closed loop two-phase thermosyphon B. Agostini & M. Habert ABB Switzerland Ltd.,
More informationPin Fin Lab Report Example. Names. ME331 Lab
Pin Fin Lab Report Example Names ME331 Lab 04/12/2017 1. Abstract The purposes of this experiment are to determine pin fin effectiveness and convective heat transfer coefficients for free and forced convection
More informationTHE EXPERIMENTAL STUDY OF THE EFFECT OF ADDING HIGH-MOLECULAR POLYMERS ON HEAT TRANSFER CHARACTERISTICS OF NANOFLUIDS
THE EXPERIMENTAL STUDY OF THE EFFECT OF ADDING HIGH-MOLECULAR POLYMERS ON HEAT TRANSFER CHARACTERISTICS OF NANOFLUIDS Dmitriy Guzei 1, *, Maxim Pryazhnikov 1, Andrey Minakov 1,, and Vladimir Zhigarev 1
More information4.1. Physics Module Form 4 Chapter 4 - Heat GCKL UNDERSTANDING THERMAL EQUILIBRIUM. What is thermal equilibrium?
Physics Module Form 4 Chapter 4 - Heat GCKL 2010 4.1 4 UNDERSTANDING THERMAL EQUILIBRIUM What is thermal equilibrium? 1. (, Temperature ) is a form of energy that flows from a hot body to a cold body.
More informationChapter 3: Steady Heat Conduction. Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University
Chapter 3: Steady Heat Conduction Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University Objectives When you finish studying this chapter, you should be able to: Understand the concept
More informationEffect of flow velocity on the process of air-steam condensation in a vertical tube condenser
Effect of flow velocity on the process of air-steam condensation in a vertical tube condenser Jan Havlík 1,*, Tomáš Dlouhý 1 1 Czech Technical University in Prague, Faculty of Mechanical Engineering, Department
More informationIMPLEMENTATION OF ETHANOL HEAT PIPE AT CETIAT
IMPLEMENTATION OF ETHANOL HEAT PIPE AT CETIAT JO Favreau 1, E Georgin 1, B Savanier 1, A. Merlone 2 1 CETIAT, 96100 Villeurbanne, France 2 INRIM, Torino, Italy Abstract. CETIAT is a calibration laboratory
More informationDetermination of effective diffusion coefficient of methane adsorption on activated carbon
Trade Science Inc. ISSN : 0974-7443 Volume 7 Issue 2 CTAIJ 7(2) 2012 [39-44] Determination of effective diffusion coefficient of methane adsorption on activated carbon Alireza Azimi*, Masoomeh Mirzaei
More informationCountercurrent heat exchanger
Countercurrent heat exchanger 1. Theoretical summary The basic operating principles and the simplified calculations regarding the counter current heat exchanger were discussed in the subject Chemical Unit
More informationPERFORMANCE ANALYSIS OF A SINGLE BASIN DOUBLE SLOPE PASSIVE SOLAR STILL
(IJAER) 212, Vol. No. 3, Issue No. II, February ISSN: 2231-5152 PERFORMANCE ANALYSIS OF A SINGLE BASIN DOUBLE SLOPE PASSIVE SOLAR STILL Vidya Sagar Gupta ABSTRACT An experimental study has been carried
More informationAn experimental investigation on condensation of R134a refrigerant in microchannel heat exchanger
Journal of Physics: Conference Series PAPER OPEN ACCESS An eperimental investigation on condensation of R134a refrigerant in microchannel heat echanger To cite this article: A S Shamirzaev 218 J. Phys.:
More informationMinhhung Doan, Thanhtrung Dang
An Experimental Investigation on Condensation in Horizontal Microchannels Minhhung Doan, Thanhtrung Dang Department of Thermal Engineering, Hochiminh City University of Technology and Education, Vietnam
More informationPROBLEM 14.6 ( )( ) (b) Applying a species balance to a control volume about the hydrogen, dt 6 dt 6RAT dt 6RT dt
PROBLEM 14.6 KNOWN: Pressure and temperature of hydrogen stored in a spherical steel tank of prescribed diameter and thickness. FIND: (a) Initial rate of hydrogen mass loss from the tank, (b) Initial rate
More informationExperiment 1. Measurement of Thermal Conductivity of a Metal (Brass) Bar
Experiment 1 Measurement of Thermal Conductivity of a Metal (Brass) Bar Introduction: Thermal conductivity is a measure of the ability of a substance to conduct heat, determined by the rate of heat flow
More informationChapter 11: Heat Exchangers. Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University
Chapter 11: Heat Exchangers Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University Objectives When you finish studying this chapter, you should be able to: Recognize numerous types of
More informationThermal Resistance Measurement across a Wick Structure using a Novel Thermosyphon Test Chamber
Purdue University Purdue e-pubs CTRC Research Publications Cooling Technologies Research Center 2008 Thermal Resistance Measurement across a Wick Structure using a Novel Thermosyphon Test Chamber T. W.
More informationGRAVITY EFFECT ON THE DISTRIBUTION OF REFRIGERANT FLOW IN A MULTI-CIRCUITED CONDENSER
Proceedings of Fifth International Conference on Enhanced, Compact and Ultra-Compact Heat Exchangers: Science, Engineering and Technology, Eds. R.K. Shah, M. Ishizuka, T.M. Rudy, and V.V. Wadekar, Engineering
More informationThe Effects of Friction Factors on Capillary Tube Length
The Effects of Friction Factors on Capillary Tube Length M.A. Akintunde, Ph.D. Department of Mechanical Engineering, Federal University of Technology, P.M.B. 7, Akure, Nigeria. E-mail: ajyinka@yahoo.com
More informationEngineering Thermodynamics. Chapter 1. Introductory Concepts and Definition
1.1 Introduction Chapter 1 Introductory Concepts and Definition Thermodynamics may be defined as follows : Thermodynamics is an axiomatic science which deals with the relations among heat, work and properties
More informationChapter Four. Experimental
Chapter Four 4.1 Materials N,N-Diethyl monoethanolamine (purity 98%) used in all experiments was purchased from Spectrochem Pvt. Ltd., Mumbai. N-Ethyl monoethanolamine, N-(- aminoethyl)ethanolamine, diethanolamine,
More informationDepartment of Mechanical Engineering ME 96. Free and Forced Convection Experiment. Revised: 25 April Introduction
CALIFORNIA INSTITUTE OF TECHNOLOGY Department of Mechanical Engineering ME 96 Free and Forced Convection Experiment Revised: 25 April 1994 1. Introduction The term forced convection refers to heat transport
More informationChapter 5: The First Law of Thermodynamics: Closed Systems
Chapter 5: The First Law of Thermodynamics: Closed Systems The first law of thermodynamics can be simply stated as follows: during an interaction between a system and its surroundings, the amount of energy
More information