Boundary-Layer Flow over a Porous Medium of a Nanofluid Past from a Vertical Cone
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1 Boundary-Layer Flow over a Porous Medium o a Nanoluid Past rom a Vertical Cone Mohammad Mehdi Keshtkar 1 and jamaladin hadizadeh 2 1 Assistant Proessor, Department o Mechanical Engineering, 2 MSc. Student, Department o Mechanical Engineering, Islamic Azad University Kerman Branch, Iran mkeshtkar54@yahoo.com Abstract This work is ocused on the study o the natural convection boundary-layer low over a downward-pointing vertical cone in a porous medium saturated with a non-newtonian nanoluid in the presence o heat generation or absorption. The boundary layer equations were normalized via similarity variables and solved numerically. The generalized governing equations derived in this work can be applied and parametric study o the physical parameters is conducted. These equations are solved by using Raunge kutta. Comparison o numerical results with previously published work, are perormed and good agreement is obtained. Keywords- Non-Newtonian, Nano luid, Heat generation or absorption, Porous media, Similarity solution. I. INTRODUCTION The natural convection low over a surace embedded in saturated porous media is encountered in many engineering problems such as the design o pebble-bed nuclear reactors, ceramic processing, crude oil drilling, geothermal energy conversion, use o ibrous material in the thermal insulation o buildings, catalytic reactors and compact heat exchangers, heat transer rom storage o agricultural products which generate heat as a result o metabolism, petroleum reservoirs, storage o nuclear wastes, etc. The derivation o the empirical equations which govern the low and heat transer in a porous medium has been discussed in [1-5]. The natural convection on vertical suraces in porous media has been studied used Darcy s law by a number o authors [6 20]. Boundary layer analysis o natural convection over a cone has been investigated by Yih [21-24]. Murthy and Singh [25] obtained the similarity solution or non-darcy mixed convection about an isothermal vertical cone with ixed apex hal angle, pointing downwards in a luid saturated porous medium with uniorm ree stream velocity, but a semi-similar solution o an unsteady mixed convection low over a rotating cone in a rotating viscous luid has been obtained Roy and Anilkumar [26]. The laminar steady no similar natural convection low o gases over an isothermal vertical cone has been investigated by Takhar et al. [27]. The development o unsteady mixed convection low o an incompressible laminar viscous luid over a vertical cone has been investigated by Singh and Roy [28] when the luid in the changed rom its ambient temperature. An analysis has been carried out by external stream is set into motion impulsively, and at the same time the surace temperature is suddenly Kumari and Nath [29] to study the non-darcy natural convention low o Newtonian luids on a vertical cone embedded in a saturated porous medium with power-law variation o the wall temperature/concentration or heat/mass lux and suction/injection. Cheng [30-34] ocused on the problem o natural convection rom a vertical cone in a porous medium with mixed thermal boundary conditions, Soret and Duour eects and with variable viscosity. Gorla and Chamkha [35] studied the natural convective boundary layer low over a non-isothermal vertical plate embedded in a porous medium saturated with a Nano luid. Khan and Pop [36] examined the ree convection boundary layer low past a horizontal lat plate embedded in a porous medium illed with a nanoluid. Chamkha et al. [37] presented the non-similar solutions or natural convective boundary layer low over a sphere embedded in a porous medium saturated with a nanoluid. Improving the technology, limit in enhancing the perormance o conventional heat transer is a main issue owing to low thermal conductivity o the most common luids such as water, oil, and ethylene- glycol mixture. Since the thermal conductivity o solids is oten higher than that o liquids, the idea o adding particles to a conventional luid to enhance its heat transer characteristics was emerged. Owing to wide range o technological applications including electronic systems, hydrocyclone devices, quenching and nuclear reactors, low over a sphere saturated in nanoluid has attracted so many attention. In this paper, the basic boundary layer equations have been reduced to a two-point boundary value problem via similarity variables, and solved numerically.
2 II. DESCRIPTION OF PROBLEM AND FORMULATION The problem o natural convection about a downward-pointing vertical cone o hal angle embedded in a porous medium saturated with a non-newtonian power-law nanoluid. The origin o the coordinate system is placed at the vertex o the ull cone, with x being the coordinate along the surace o the cone measured rom the origin and y being the coordinate perpendicular to the conical surace Fig (1). The temperature o the porous medium on the surace o the cone is kept at constant temperature T, and the ambient porous medium temperature is held at constant temperature T.The nanoluid properties are assumed to be constant except or density variations in the buoyancy orce term. The thermo physical properties o the nanoluid are given in Table 1 (see Oztop and Abu -Nada [39]). Assuming that the thermal boundary layer is suiciently thin compared with the local radius, the equations governing the problem o Darcy low through a homogeneous porous medium saturated with power-law nanoluid near the vertical cone can be written in two-dimensional Cartesian coordinates (x,y). In this analysis we will consider the volumetric rate o heat generation, Q W m as: 3 w Q( T T ) Q 0 T T T T where Q is the heat generation coeicient. Figure 1. A schematic diagram o the physical model. The velocity and temperature ields in the boundary layer are governed by the two-dimensional boundary layer equations or mass, momentum and thermal energy: Continuity equation: (1) Momentum equation: Integration the momentum Eq. (2) we have: (2) (3) Energy equation:
3 Where u and v are the volume-averaged velocity components in the x and y directions, respectively, T is the volume-averaged temperature. n is the power-law viscosity index o the power-law nanoluid and g is the gravitational acceleration. m 0 corresponds to low over a vertical lat plate and m 1corresponds to low over a vertical cone. n is the viscosity index. For the case o n 1, the base luid is Newtonian. We note that n 1and n 1represent pseudo-plastic luid and dilatants luid, respectively. Property n and n are the density and eective viscosity o the nanoluid, and K is the modiied permeability o the porous medium. And Q is the heat generation coeicient. Furthermore, n and n are the equivalent thermal diusivity and the thermal expansion coeicient o the saturated porous medium, which are deined as (see Khanaer et al. [36]): (4) C p 1 C p C p n s (5) Here is the solid volume raction. The associated boundary conditions o Eqs. (1)-(4) can be written as: (6) where respectively, k and is the viscosity o the basic luid, C p and C p s and s are the densities o the pure luid and nanoparticle, are the speciic heat parameters o the base luid and nanoparticle, respectively, k s are the thermal conductivities o the base luid and nanoparticle, respectively. The local radius to a point in the boundary layer r can be represented by the local radius o the vertical cone r=x sinγ. TABLE 1 Thermo-physical properties o water and nanoparticles Physical properties Pure water Cu Al2O3 TiO2 Cp (J/kg K) (Kg/m 3 ) K (W/mK) By introducing the ollowing non-dimensional variables:
4 (7) The continuity equation is automatically satisied by deining a stream unction ( x, y) such that: (8) where; Ra x x kg cos T T w 1 n (9) Substituting variables (7) into Eqs. (1) (6), we obtain the ollowing system o ordinary dierential equations: (10) (11) (12) along with the boundary conditions: (13) where primes denote dierentiation with respect to, the quantity o practical interest, in this chapter is the Nusselt number Nu which is deined in the orm. and is the heat generation or absorption parameter. x where h denotes the local heat transer coeicient. (14) III. RESULT AND DISCUSSION In this study we have presented similarity reductions or the eect o nanoparticle volume transormations. The numerical solutions o the resulted similarity reductions are obtained or the original variables which are shown in Eqs. (10) and (11) along with the boundary conditions (13) by using the secant method. The physical quantity o interest here is the Nusselt number Nu and it is obtained and shown in Eqs. (14) The distributions o the velocity ( ), the temperature ( ) x rom Eqs.(10) and (11) and the Nusselt number in the case o Cu-
5 water and Ag-water are shown in Figs The computations are carried or various values o the nanoparticles volume raction or dierent types o nanoparticles, when the base luid is water. Nanoparticles volume raction is varied rom 0 to 0.3. The nanoparticles used in the study are rom Copper (Cu), Silver (Ag), Alumina (Al 2 O 3 ) and Titanium oxide (TiO 2 ). Table 2: Values o θ (0) or various ϕ and λ when n=1. Cu Ag Al 2O 3 TiO Cu Ag Al 2O 3 TiO Cu Ag Al 2O 3 TiO (a) (b) Figure 2: Temperature proiles at dierent volume raction o nanoparticles (Cu - water): (a)with the production o heat,; λ = 0.05 (b) with out generating heat. Figure 2 Eect o heat production and changes in the volume raction o nanoparticles shows the temperature distribution. Nanoluids made o copper particles and the luid is water. With increasing volume raction o nanoparticles rom 0 to 0.3 in both cases, i.e. no heat generation and temperature distribution, heat production increases. Large impact on the temperature proile does not generate heat and temperature distribution with no heat production is almost identical. Figure 3 Eect o heat production and changes in the volume raction o nanoparticles shows the temperature distribution. The nanoparticles are made o aluminum and liquid water. The nano-luid temperature distribution
6 o copper nano-luids - water is almost identical. With increasing volume raction o nanoparticles in both cases, i.e. no heat generation and temperature distribution, heat production increases. The heat does not have a large impact on the temperature proile. (a) (b) Figure 3: Temperature proiles at dierent volume raction o nanoparticles (alumina - water): (a) the production o heat λ = 0.05; (B) without generating heat. Figure 4 shows the eect o changing temperature and volume raction o nanoparticles on the velocity distribution show. Nanoluids made o copper particles and the luid is water. Nanvaz particle volume raction increases rom 0 to 0.3 in both cases, ie no heat production and heat production. Velocity distribution in the 1.8> η decreases in η> 1.8 increases. Heat generating has not big eects on the velocity proile and it is almost same as another case (No Heat production case). Figure 5 shows the eect o changing temperature and volume raction o nanoparticles on the velocity distribution show. The nanoparticles are made o aluminum and liquid water. The nano-luid low rate nm copper - water is higher, but the dierence in speed is very low. With increasing volume raction o nanoparticles in both cases, i.e. no heat production and heat production, velocity distribution in the 1.8> η decreases in η> 1.8 increases. Big eect on the velocity proile does not generate heat and produce almost no heat is the same. (a) (b) Figure 4: The velocity proiles at dierent volume raction o nanoparticles (Cu - water): (a) the production o heat,; λ = 0.05 (b) without generating heat.
7 (b) (a) Figure 5: The velocity proiles at dierent volume raction o nano particles (aluminum - water): (a) the production o heat,; λ = 0.05 (b) without generating heat. IV. CONCLUSIONS A numerical study on the steady boundary layer low and heat transer o nanoluid over a downward-pointing vertical cone in a porous medium saturated with a non-newtonian nanoluid in the presence o heat generation or absorption has been perormed. Boundary layer equations were solved numerically by the Rung Kutta method with shooting technique on the natural convection boundary-layer low. The generalized governing equations derived in this work can be applied and parametric study o the physical parameters is conducted. These equations are solved by using Raunge kutta. Results show that, with increasing volume raction o nanoparticles rom 0 to 0.3 in both cases, i.e. no heat generation and temperature distribution, heat production increases. Also, It is shown that, With increasing volume raction o nanoparticles in both cases, heat production increases. It is seen that, increasing volume raction o nanoparticles in both cases, velocity distribution in the 1.8> η decreases in η> 1.8 increases. Comparisons with previously published work are perormed and good agreement is obtained. REFERENCES [1] Cheng P (1978) Heat transerin geothermal systems. Adv. Heat Transer14: [2] Nield DA, Bejan A (1999) Convection in Porous Media. second ed.,springer: New York. [3] Vaai K (2000) Handbook o Porous Media. Marcel Dekker: New York. [4] Pop I, Ingham DB (2001) Convective Heat Transer: Mathematical and Computational Modelling o Viscous Fluids and Porous Media. Pergamon Press:Oxord. [5] Ingham DB, Pop I (2002) Transport Phenomena in Porous Media. Pergamon Press: Oxord [6] Cheng P, Minkowycz WJ (1977) Free convectionabout a vertical lat plate embedded in a porous medium with application to heat transer rom a dike. J. Geophys. Res.82(14): [7] Gorla RSR, Tornabene R (1988) Free convectionrom a vertical plate with nonuniorm surace heat lux and embedded in a porous medium. Transp. Porous Media3 : [8] Bakier AY, Mansour MA, Gorla RSR, EbianaAB (1997) Nonsimilar solutions or ree convection rom a vertical plate in porous media. Heat Mass Transer33: [9] Gorla RSR, Mansour MA, Abdel-Gaied SM (1999) Natural convection rom a vertical plate in a porous medium using Brinkman s model. Transp. Porous Media36 : [10] Mulolani I, Rahman M (2000) Similarity analysis or natural convection rom a vertical plate with distributed wall concentration. Int. J. Math. math. Sci.23(5) : [11] Jumah RY, Mujumdar AS (2000) Free convection heat and mass transer o nonnewtonian power law luids with yield stress rom a vertical plate in saturated porous media.int. Comm. Heat Mass Transer27 : [12] Groşan T, Pop I (2001) Free convection over a vertical lat plate with a variable wall temperature and internal heat generati on in a porous medium saturated with a nonnewtonian luid. Technische Mechanik21(4) : [13] Kumaran V, Pop I (2006) Steady ree convection boundary layer over a vertical lat plateo embedded in a porous medium illed with water at 4 C. Int. J. Heat Mass Transer49 : [14] Magyari E, Pop I, Keller B (2006) Unsteady ree convection along an ininite vertical lat plate embedded in a stably stratiied luidsaturated porous medium. Transp. Porous Media62 : [15] Cheng C-Y (2006) Natural convection heatand mass transer o non-newtonian power law luids with yield stress in porous media rom a vertical plate with variable wall heat and mass luxes. Int. Comm. Heat Mass Transer33 :
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