convection coefficient, h c = 18.1 W m K and the surrounding temperature to be 20 C.) (20 marks) Question 3 [35 marks]
|
|
- MargaretMargaret Cameron
- 6 years ago
- Views:
Transcription
1 COP 311 June Examination 18 June 005 Duration: 3 hours Starting time: 08:30 Internal examiners: Prof. T. Majozi Mnr. D.J. de Kock Mnr. A.T. Tolmay External examiner: Mnr. B. du Plessis Metallurgists: Questions 1,, 4, 5 and 6 Chemical Engineering: Questions 3, 4, 5 and 6 Question 1 Two small blackened spheres of identical size are suspended by thin wires inside a large cavity of ice water where ice and liquid water is present. The one sphere is made of aluminium while the other is made of an unknown alloy of high thermal conductivity. It is found that it takes 4.8 minutes for the temperature of the aluminium sphere to drop from 3 C to 1 C, and 9.6 minutes for the alloy sphere to undergo the same change. What is the specific heat of the alloy if its density is measured at 5400 kg/m 3? (15 marks) Question [0 marks] The tip of a soldering iron consists of a 0.6 cm diameter copper rod, 7.6 cm long. If the tip temperature must be higher than 10 C, what are the required minimum temperature of the base and the heat flow into the base? (Assume that average convection coefficient, h c = 18.1 W m K and the surrounding temperature to be 0 C.) (0 marks) Question 3 [35 marks] State the necessary conditions for the applicability of the Hagen-Poiseuille equation in fluid flow. [5 marks] Figure 1 shows a section of a circular conduit through which a fluid flows VERTICALLY downwards. Assuming the conditions mentioned in hold, choose a differential control volume and derive the appropriate form of the Hagen-Poiseuille equation. In the course of your derivation, Equation (1) might prove relevant. Demonstrate the derivation of Eq. (1) under conditions applicable in this situation. υmax = υ average (1) 1
2 y x g v Figure 1 Vertical circular conduit A common type of viscometer for liquids consists of a relatively large reservoir with a very slender outlet tube, the rate of outflow being determined by timing the fall in the surface level (Fig. ). If oil of constant density flows out of the viscometer shown at the rate of 0.3 cm 3 /s, calculate the dynamic viscosity of the fluid using the expression derived in. The tube diameter is 0. cm and ρ oil is 890 kg/m 3. Oil 8 cm 55 cm Figure Viscometer
3 Question 4 (5 marks) Shown in Fig. 3 are two concentric spheres with a hollow space in between. If the surface of the inner sphere is at 100 o C and that of the outer sphere at 3 o C, (i) (ii) determine the temperature 33 cm from the centre of the inner sphere. Assume constant conductivity of air (k =. W/m /K) between the spheres and steadystate conditions. [10 marks] Demonstrate that in general, the temperature varies hyperbolically with the radius r. r T R 1 =30 cm R =40 cm T 1 T Figure 3 Two concentric spheres Question 5 (d) State the conditions under which Fick rate equation is applicable. [ marks] In situations where these conditions do not hold, what other similar correlation(s) could you propose and why? [ marks] Under what conditions is N A equal or nearly equal to J A? Kindly demonstrate this using the Fick rate equation as the basis. [7 marks] A mixture of He and N gas is contained in a pipe at 98 K and 1 atm total pressure which is constant throughout. At one end of the pipe at point 1 the partial pressure p A1 of He is 0.60 atm and at the other end 0. m away from point 1 at point the partial pressure p A of He is 0.0 atm. Calculate the flux of He at steady state if D AB of the He-N mixture is x 10-4 m /s. Use SI units. (1 atm = kpa; R = J/mol/K). [4 marks] Question 6 [35 marks] Figure 4 shows the Arnold cell arrangement that is usually used in experimental determination of the diffusion coefficient. In this experiment, gas B is insoluble in liquid A. Under peudo-steady-state conditions, the level of pure liquid inside the tube decreases at a negligible rate due to evaporation and subsequently diffusion. Taking this observation into account, kindly 3
4 demonstrate that the diffusion of component A along the diffusion path can be expressed by Equation (). N A, z ρ A = M, L A dz dt (), where ρ A,L is the density of pure liquid A and M A the molar mass. [5 marks] Assuming perfect steady-state conditions and insolubility of gas B in A, show that Equation (3) also holds. N A, z cdab z z1 ( y y ) A,1 A, yb, lm = (3), where y B,lm is the logarithmic-mean average concentration of component B and defined as y B, lm = yb, yb,1 y B, ln yb,1 In an experiment conducted in one of the laboratories it was observed that the liquid level dropped by m over hours for a pure liquid A with the following properties. M A = 5 g/mol ρ A,L = 800 kg/m 3 The length of the diffusion path before the experiment was measured to be 55 cm. The temperature and pressure along the diffusion path were maintained at 5 0 C and 105 kpa, respectively, throughout the experiment. At pseudosteady-state conditions, the partial pressure of component A was measured to be 100 kpa on the liquid surface and about 5 kpa at the top of the tube, i.e. end of the diffusion path. Using Equations () and (3) above, determine the diffusivity of gas A into gas B (D AB ) for this experimental observation. 4
5 Flow of gas B N Az z+ z z z z 1 (t 1 ) N Az z z 1 (t 0 ) Pure liquid A Figure 4 Arnold cell arrangement for determination of diffusivity 5
Introduction to Mass Transfer
Introduction to Mass Transfer Introduction Three fundamental transfer processes: i) Momentum transfer ii) iii) Heat transfer Mass transfer Mass transfer may occur in a gas mixture, a liquid solution or
More informationSHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT B.Tech. [SEM V (ME-51, 52, 53, 54)] QUIZ TEST-1 (Session: )
QUIZ TEST-1 Time: 1 Hour HEAT AND MASS TRANSFER Note: All questions are compulsory. Q1) The inside temperature of a furnace wall ( k=1.35w/m.k), 200mm thick, is 1400 0 C. The heat transfer coefficient
More informationIntroduction to Heat and Mass Transfer. Week 5
Introduction to Heat and Mass Transfer Week 5 Critical Resistance Thermal resistances due to conduction and convection in radial systems behave differently Depending on application, we want to either maximize
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 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 informationCHAPTER 3 BASIC EQUATIONS IN FLUID MECHANICS NOOR ALIZA AHMAD
CHAPTER 3 BASIC EQUATIONS IN FLUID MECHANICS 1 INTRODUCTION Flow often referred as an ideal fluid. We presume that such a fluid has no viscosity. However, this is an idealized situation that does not exist.
More informationConvection Heat Transfer. Introduction
Convection Heat Transfer Reading Problems 12-1 12-8 12-40, 12-49, 12-68, 12-70, 12-87, 12-98 13-1 13-6 13-39, 13-47, 13-59 14-1 14-4 14-18, 14-24, 14-45, 14-82 Introduction Newton s Law of Cooling Controlling
More informationMass Transfer Operations
College of Engineering Tutorial # 1 Chemical Engineering Dept. 14/9/1428 1. Methane and helium gas mixture is contained in a tube at 101.32 k Pa pressure and 298 K. At one point the partial pressure methane
More informationLevel 7 Post Graduate Diploma in Engineering Heat and mass transfer
9210-221 Level 7 Post Graduate Diploma in Engineering Heat and mass transfer 0 You should have the following for this examination one answer book non programmable calculator pen, pencil, drawing instruments
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 informationOutline. Definition and mechanism Theory of diffusion Molecular diffusion in gases Molecular diffusion in liquid Mass transfer
Diffusion 051333 Unit operation in gro-industry III Department of Biotechnology, Faculty of gro-industry Kasetsart University Lecturer: Kittipong Rattanaporn 1 Outline Definition and mechanism Theory of
More informationSteady-State Molecular Diffusion
Steady-State Molecular Diffusion This part is an application to the general differential equation of mass transfer. The objective is to solve the differential equation of mass transfer under steady state
More informationS.E. (Chemical) (Second Semester) EXAMINATION, 2011 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100
Total No. of Questions 12] [Total No. of Printed Pages 7 [4062]-186 S.E. (Chemical) (Second Semester) EXAMINATION, 2011 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100 N.B. : (i) Answers
More informationPrinciples of Food and Bioprocess Engineering (FS 231) Exam 2 Part A -- Closed Book (50 points)
Principles of Food and Bioprocess Engineering (FS 231) Exam 2 Part A -- Closed Book (50 points) 1. Are the following statements true or false? (20 points) a. Thermal conductivity of a substance is a measure
More informationERT 216 HEAT & MASS TRANSFER SEM2, 2013/2014
ERT 16 HET & MSS TRNSFER SEM, 01/014 Tutorial: Principles of Mass Transfer (Part 1) gas of CH 4 and He is contained in a tube at 10 kpa pressure and 98 K. t one point the partial pressure of methane is
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 informationPart I.
Part I bblee@unimp . Introduction to Mass Transfer and Diffusion 2. Molecular Diffusion in Gasses 3. Molecular Diffusion in Liquids Part I 4. Molecular Diffusion in Biological Solutions and Gels 5. Molecular
More informationME 309 Fluid Mechanics Fall 2010 Exam 2 1A. 1B.
Fall 010 Exam 1A. 1B. Fall 010 Exam 1C. Water is flowing through a 180º bend. The inner and outer radii of the bend are 0.75 and 1.5 m, respectively. The velocity profile is approximated as C/r where C
More informationCircle one: School of Mechanical Engineering Purdue University ME315 Heat and Mass Transfer. Exam #1. February 20, 2014
Circle one: Div. 1 (Prof. Choi) Div. 2 (Prof. Xu) School of Mechanical Engineering Purdue University ME315 Heat and Mass Transfer Exam #1 February 20, 2014 Instructions: Write your name on each page Write
More informationHeat and Mass Transfer Unit-1 Conduction
1. State Fourier s Law of conduction. Heat and Mass Transfer Unit-1 Conduction Part-A The rate of heat conduction is proportional to the area measured normal to the direction of heat flow and to the temperature
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 informationAutumn 2005 THERMODYNAMICS. Time: 3 Hours
CORK INSTITUTE OF TECHNOOGY Bachelor of Engineering (Honours) in Mechanical Engineering Stage 3 (Bachelor of Engineering in Mechanical Engineering Stage 3) (NFQ evel 8) Autumn 2005 THERMODYNAMICS Time:
More informationStudy fluid dynamics. Understanding Bernoulli s Equation.
Chapter Objectives Study fluid dynamics. Understanding Bernoulli s Equation. Chapter Outline 1. Fluid Flow. Bernoulli s Equation 3. Viscosity and Turbulence 1. Fluid Flow An ideal fluid is a fluid that
More informationChapter 4 DYNAMICS OF FLUID FLOW
Faculty Of Engineering at Shobra nd Year Civil - 016 Chapter 4 DYNAMICS OF FLUID FLOW 4-1 Types of Energy 4- Euler s Equation 4-3 Bernoulli s Equation 4-4 Total Energy Line (TEL) and Hydraulic Grade Line
More informationPHYSICAL MECHANISM OF CONVECTION
Tue 8:54:24 AM Slide Nr. 0 of 33 Slides PHYSICAL MECHANISM OF CONVECTION Heat transfer through a fluid is by convection in the presence of bulk fluid motion and by conduction in the absence of it. Chapter
More informationTutorial 1. Where Nu=(hl/k); Reynolds number Re=(Vlρ/µ) and Prandtl number Pr=(µCp/k)
Tutorial 1 1. Explain in detail the mechanism of forced convection. Show by dimensional analysis (Rayleigh method) that data for forced convection may be correlated by an equation of the form Nu = φ (Re,
More informationFigure 3: Problem 7. (a) 0.9 m (b) 1.8 m (c) 2.7 m (d) 3.6 m
1. For the manometer shown in figure 1, if the absolute pressure at point A is 1.013 10 5 Pa, the absolute pressure at point B is (ρ water =10 3 kg/m 3, ρ Hg =13.56 10 3 kg/m 3, ρ oil = 800kg/m 3 ): (a)
More informationHEAT- I Part - A C D A B. Te m p. Heat input
e m p HE- I Part -. solid material is supplied with heat at a constant rate. he temperature of the material is changing with heat input as shown in the graph. Study the graph carefully and answer the following
More informationReynolds, an engineering professor in early 1880 demonstrated two different types of flow through an experiment:
7 STEADY FLOW IN PIPES 7.1 Reynolds Number Reynolds, an engineering professor in early 1880 demonstrated two different types of flow through an experiment: Laminar flow Turbulent flow Reynolds apparatus
More information1. Nusselt number and Biot number are computed in a similar manner (=hd/k). What are the differences between them? When and why are each of them used?
1. Nusselt number and Biot number are computed in a similar manner (=hd/k). What are the differences between them? When and why are each of them used?. During unsteady state heat transfer, can the temperature
More informationHydraulics. B.E. (Civil), Year/Part: II/II. Tutorial solutions: Pipe flow. Tutorial 1
Hydraulics B.E. (Civil), Year/Part: II/II Tutorial solutions: Pipe flow Tutorial 1 -by Dr. K.N. Dulal Laminar flow 1. A pipe 200mm in diameter and 20km long conveys oil of density 900 kg/m 3 and viscosity
More informationTransient Heat Transfer Experiment. ME 331 Introduction to Heat Transfer. June 1 st, 2017
Transient Heat Transfer Experiment ME 331 Introduction to Heat Transfer June 1 st, 2017 Abstract The lumped capacitance assumption for transient conduction was tested for three heated spheres; a gold plated
More information2. Modeling of shrinkage during first drying period
2. Modeling of shrinkage during first drying period In this chapter we propose and develop a mathematical model of to describe nonuniform shrinkage of porous medium during drying starting with several
More informationIntroduction to Partial Differential Equations
Introduction to Partial Differential Equations Philippe B. Laval KSU Current Semester Philippe B. Laval (KSU) 1D Heat Equation: Derivation Current Semester 1 / 19 Introduction The derivation of the heat
More informationINTRODUCTION TO FLUID MECHANICS June 27, 2013
INTRODUCTION TO FLUID MECHANICS June 27, 2013 PROBLEM 3 (1 hour) A perfect liquid of constant density ρ and constant viscosity µ fills the space between two infinite parallel walls separated by a distance
More informationLiquid or gas flow through pipes or ducts is commonly used in heating and
cen58933_ch08.qxd 9/4/2002 11:29 AM Page 419 INTERNAL FORCED CONVECTION CHAPTER 8 Liquid or gas flow through pipes or ducts is commonly used in heating and cooling applications. The fluid in such applications
More informationChapter 2 HEAT CONDUCTION EQUATION
Heat and Mass Transfer: Fundamentals & Applications 5th Edition in SI Units Yunus A. Çengel, Afshin J. Ghajar McGraw-Hill, 2015 Chapter 2 HEAT CONDUCTION EQUATION Mehmet Kanoglu University of Gaziantep
More information10 minutes reading time is allowed for this paper.
EGT1 ENGINEERING TRIPOS PART IB Tuesday 31 May 2016 2 to 4 Paper 4 THERMOFLUID MECHANICS Answer not more than four questions. Answer not more than two questions from each section. All questions carry the
More informationElectrical Power Cables Part 2 Cable Rating Calculations
ELEC971 High Voltage Systems Electrical Power Cables Part Cable Rating Calculations The calculation of cable ratings is a very complex determination because of the large number of interacting characteristics
More information5 ENERGY EQUATION OF FLUID MOTION
5 ENERGY EQUATION OF FLUID MOTION 5.1 Introduction In order to develop the equations that describe a flow, it is assumed that fluids are subject to certain fundamental laws of physics. The pertinent laws
More informationExamination Heat Transfer
Examination Heat Transfer code: 4B680 date: 17 january 2006 time: 14.00-17.00 hours NOTE: There are 4 questions in total. The first one consists of independent sub-questions. If necessary, guide numbers
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 informationThermal Analysis of Shell and Tube Heat Ex-Changer Using C and Ansys
Thermal Analysis of Shell and Tube Heat Ex-Changer Using C and Ansys A v.hari Haran,*, B g.ravindra Reddy and C b.sreehari a) PG Student Mechanical Engineering Department Siddharth Institute Of Engineering
More informationBAE 820 Physical Principles of Environmental Systems
BAE 820 Physical Principles of Environmental Systems Estimation of diffusion Coefficient Dr. Zifei Liu Diffusion mass transfer Diffusion mass transfer refers to mass in transit due to a species concentration
More informationV/ t = 0 p/ t = 0 ρ/ t = 0. V/ s = 0 p/ s = 0 ρ/ s = 0
UNIT III FLOW THROUGH PIPES 1. List the types of fluid flow. Steady and unsteady flow Uniform and non-uniform flow Laminar and Turbulent flow Compressible and incompressible flow Rotational and ir-rotational
More informationFLOW IN CONDUITS. Shear stress distribution across a pipe section. Chapter 10
Chapter 10 Shear stress distribution across a pipe section FLOW IN CONDUITS For steady, uniform flow, the momentum balance in s for the fluid cylinder yields Fluid Mechanics, Spring Term 2010 Velocity
More informationIntroduction to Heat and Mass Transfer. Week 10
Introduction to Heat and Mass Transfer Week 10 Concentration Boundary Layer No concentration jump condition requires species adjacent to surface to have same concentration as at the surface Owing to concentration
More informationPhysics to PDE. Tutorial
Physics to PDE Tutorial 1 1. Exercise Heat Transfer: Heat conduction in the steady state 2. Exercise Structural Mechanics: Bending test 3. Exercise Electrodynamics: Plate capacitor 4. Exercise Fluid Dynamics:
More informationS.E. (Chemical) (Second Semester) EXAMINATION, 2012 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100
Total No. of Questions 12] [Total No. of Printed Pages 7 Seat No. [4162]-187 S.E. (Chemical) (Second Semester) EXAMINATION, 2012 HEAT TRANSFER (2008 PATTERN) Time : Three Hours Maximum Marks : 100 N.B.
More informationMass of fluid leaving per unit time
5 ENERGY EQUATION OF FLUID MOTION 5.1 Eulerian Approach & Control Volume In order to develop the equations that describe a flow, it is assumed that fluids are subject to certain fundamental laws of physics.
More informationMechanical Engineering Programme of Study
Mechanical Engineering Programme of Study Fluid Mechanics Instructor: Marios M. Fyrillas Email: eng.fm@fit.ac.cy SOLVED EXAMPLES ON VISCOUS FLOW 1. Consider steady, laminar flow between two fixed parallel
More informationFluid Mechanics II Viscosity and shear stresses
Fluid Mechanics II Viscosity and shear stresses Shear stresses in a Newtonian fluid A fluid at rest can not resist shearing forces. Under the action of such forces it deforms continuously, however small
More informationOverall Heat Transfer Coefficient
Overall Heat Transfer Coefficient A heat exchanger typically involves two flowing fluids separated by a solid wall. Heat is first transferred from the hot fluid to the wall by convection, through the wall
More informationECE309 INTRODUCTION TO THERMODYNAMICS & HEAT TRANSFER. 10 August 2005
ECE309 INTRODUCTION TO THERMODYNAMICS & HEAT TRANSFER 0 August 2005 Final Examination R. Culham & M. Bahrami This is a 2 - /2 hour, closed-book examination. You are permitted to use one 8.5 in. in. crib
More informationEXPERIMENT 1 DETERMINATION OF GAS DIFFUSION COEFFICIENT
EXPERIMENT 1 DETERMINATION OF GAS DIFFUSION COEFFICIENT Objective: The objective of this experiment is to calculate diffusion coefficient of a volatile organic compound in air by means of Chapman Enskog
More informationEXPERIMENTAL AND THEORETICAL ANALYSIS OF TRIPLE CONCENTRIC TUBE HEAT EXCHANGER
EXPERIMENTAL AND THEORETICAL ANALYSIS OF TRIPLE CONCENTRIC TUBE HEAT EXCHANGER 1 Pravin M. Shinde, 2 Ganesh S. Yeole, 3 Abhijeet B. Mohite, 4 Bhagyashree H. Mahajan. 5 Prof. D. K. Sharma. 6 Prof. A. K.
More informationFORMULA SHEET. General formulas:
FORMULA SHEET You may use this formula sheet during the Advanced Transport Phenomena course and it should contain all formulas you need during this course. Note that the weeks are numbered from 1.1 to
More informationTransport processes. 7. Semester Chemical Engineering Civil Engineering
Transport processes 7. Semester Chemical Engineering Civil Engineering 1 Course plan 1. Elementary Fluid Dynamics 2. Fluid Kinematics 3. Finite Control Volume nalysis 4. Differential nalysis of Fluid Flow
More informationDifferential equations of mass transfer
Differential equations of mass transfer Definition: The differential equations of mass transfer are general equations describing mass transfer in all directions and at all conditions. How is the differential
More informationMULTIPLE-CHOICE PROBLEMS:(Two marks per answer) (Circle the Letter Beside the Most Correct Answer in the Questions Below.)
MULTIPLE-CHOICE PROLEMS:(Two marks per answer) (Circle the Letter eside the Most Correct Answer in the Questions elow.) 1. The absolute viscosity µ of a fluid is primarily a function of: a. Density. b.
More informationCoolant. Circuits Chip
1) A square isothermal chip is of width w=5 mm on a side and is mounted in a subtrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of a coolant
More informationPhysics 202 Exam 1. May 1, 2013
Name: Physics 202 Exam 1 May 1, 2013 Word Problems Show all your work and circle your final answer. (Ten points each.) 1. If 2.4 m 3 of a gas initially at STP is compressed to 1.6 m 3 and its temperature
More informationFE Fluids Review March 23, 2012 Steve Burian (Civil & Environmental Engineering)
Topic: Fluid Properties 1. If 6 m 3 of oil weighs 47 kn, calculate its specific weight, density, and specific gravity. 2. 10.0 L of an incompressible liquid exert a force of 20 N at the earth s surface.
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 informationQ1. Ans: (1.725) =5.0 = Q2.
Coordinator: Dr. A. Naqvi Wednesday, January 11, 2017 Page: 1 Q1. Two strings, string 1 with a linear mass density of 1.75 g/m and string 2 with a linear mass density of 3.34 g/m are tied together, as
More informationGATE question papers: Chemical Engineering 009 (CH) GATE question papers: Chemical Engineering 009 (CH) Q. Q. 0 carry one mark each.. The direction of largest increase of the function xy 3 x at the point
More informationAP PHYSICS 2 WHS-CH-14 Heat Show all your work, equations used, and box in your answers! 1 108kg
AP PHYSICS 2 WHS-CH-4 Heat Show all your work, equations used, and box in your answers! James Prescott Joule (88 889) James Prescott Joule studied the nature of heat, and discovered its relationship to
More informationHandout 5: Current and resistance. Electric current and current density
1 Handout 5: Current and resistance Electric current and current density Figure 1 shows a flow of positive charge. Electric current is caused by the flow of electric charge and is defined to be equal to
More informationChapter 7: External Forced Convection. Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University
Chapter 7: External Forced Convection Dr Ali Jawarneh Department of Mechanical Engineering Hashemite University Objectives When you finish studying this chapter, you should be able to: Distinguish between
More informationThermal Unit Operation (ChEg3113)
Thermal Unit Operation (ChEg3113) Lecture 3- Examples on problems having different heat transfer modes Instructor: Mr. Tedla Yeshitila (M.Sc.) Today Review Examples Multimode heat transfer Heat exchanger
More informationFatima
Fatima QUESTION BANK DEPARTMENT: MECH SEMESTER: IV SUBJECT CODE / Name: ME 2251/HEAT AND MASS TRANSFER UNIT I: CONDUCTION PART -A (2 Marks) 1. What is Fourier's Law of heat conduction? (May 05, May 06,
More informationHEAT EXCHANGER. Objectives
HEAT EXCHANGER Heat exchange is an important unit operation that contributes to efficiency and safety of many processes. In this project you will evaluate performance of three different types of heat exchangers
More informationConstants and Conversions: g = 9.81 m/s 2 = 32.2 ft/s 2 ρ water = 1000 kg/m 3 C water = 1 cal/g-k 1 cal = J 1 L = 1.
EF 152 Final Exam - Fall 2006, Page 1 of 7, Name: Section: Exam Overview: a) The exam consists of 12 questions worth 8 points each (you get 4 points for putting your name and correctly identifying your
More informationLecture 30 Review of Fluid Flow and Heat Transfer
Objectives In this lecture you will learn the following We shall summarise the principles used in fluid mechanics and heat transfer. It is assumed that the student has already been exposed to courses in
More informationLectures on Applied Reactor Technology and Nuclear Power Safety. Lecture No 6
Lectures on Nuclear Power Safety Lecture No 6 Title: Introduction to Thermal-Hydraulic Analysis of Nuclear Reactor Cores Department of Energy Technology KTH Spring 2005 Slide No 1 Outline of the Lecture
More informationMM303 FLUID MECHANICS I PROBLEM SET 1 (CHAPTER 2) FALL v=by 2 =-6 (1/2) 2 = -3/2 m/s
MM303 FLUID MECHANICS I PROBLEM SET 1 (CHAPTER ) FALL 018 1) For the velocity fields given below, determine: i) Whether the flow field is one-, two-, or three-dimensional, and why. ii) Whether the flow
More informationPHYS102 Previous Exam Problems. Temperature, Heat & The First Law of Thermodynamics
PHYS102 Previous Exam Problems CHAPTER 18 Temperature, Heat & The First Law of Thermodynamics Equilibrium & temperature scales Thermal expansion Exchange of heat First law of thermodynamics Heat conduction
More informationName: ME 315: Heat and Mass Transfer Spring 2008 EXAM 2 Tuesday, 18 March :00 to 8:00 PM
Name: ME 315: Heat and Mass Transfer Spring 2008 EXAM 2 Tuesday, 18 March 2008 7:00 to 8:00 PM Instructions: This is an open-book eam. You may refer to your course tetbook, your class notes and your graded
More informationChapter 2 HEAT CONDUCTION EQUATION
Heat and Mass Transfer: Fundamentals & Applications Fourth Edition Yunus A. Cengel, Afshin J. Ghajar McGraw-Hill, 2011 Chapter 2 HEAT CONDUCTION EQUATION Mehmet Kanoglu University of Gaziantep Copyright
More informationPROBLEM 8.3 ( ) p = kg m 1m s m 1000 m = kg s m = bar < P = N m 0.25 m 4 1m s = 1418 N m s = 1.
PROBLEM 8.3 KNOWN: Temperature and velocity of water flow in a pipe of prescribed dimensions. FIND: Pressure drop and pump power requirement for (a) a smooth pipe, (b) a cast iron pipe with a clean surface,
More informationQuestion Figure shows the strain-stress curve for a given material. What are (a) Young s modulus and (b) approximate yield strength for this material?
Question. A steel wire of length 4.7 m and cross-sectional area 3.0 x 10-5 m 2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 x 10-5 m 2 under a given load.
More informationResearch Article Numerical Study of Laminar Flow Forced Convection of Water-Al 2 O 3 Nanofluids under Constant Wall Temperature Condition
Mathematical Problems in Engineering Volume 2015, Article ID 180841, 8 pages http://dx.doi.org/10.1155/2015/180841 search Article Numerical Study of Laminar Flow Forced Convection of Water-Al 2 O 3 Nanofluids
More informationTime-Dependent Conduction :
Time-Dependent Conduction : The Lumped Capacitance Method Chapter Five Sections 5.1 thru 5.3 Transient Conduction A heat transfer process for which the temperature varies with time, as well as location
More informationHeat Transfer Convection
Heat ransfer Convection Previous lectures conduction: heat transfer without fluid motion oday (textbook nearly 00 pages) Convection: heat transfer with fluid motion Research methods different Natural Convection
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 informationThermal conductivity measurement of two microencapsulated phase change slurries
Thermal conductivity measurement of two microencapsulated phase change slurries Xiaoli Ma (corresponding author), Siddig Omer, Wei Zhang and S. B. Riffat Institute of Sustainable Energy Technology, School
More informationK n. III. Gas flow. 1. The nature of the gas : Knudsen s number. 2. Relative flow : Reynold s number R = ( dimensionless )
III. Gas flow. The nature of the gas : Knudsen s number K n λ d 2. Relative flow : U ρ d η U : stream velocity ρ : mass density Reynold s number R ( dimensionless ) 3. Flow regions - turbulent : R > 2200
More informationSection A 01. (12 M) (s 2 s 3 ) = 313 s 2 = s 1, h 3 = h 4 (s 1 s 3 ) = kj/kgk. = kj/kgk. 313 (s 3 s 4f ) = ln
0. (a) Sol: Section A A refrigerator macine uses R- as te working fluid. Te temperature of R- in te evaporator coil is 5C, and te gas leaves te compressor as dry saturated at a temperature of 40C. Te mean
More informationRate of Flow Quantity of fluid passing through any section (area) per unit time
Kinematics of Fluid Flow Kinematics is the science which deals with study of motion of liquids without considering the forces causing the motion. Rate of Flow Quantity of fluid passing through any section
More informationIntroduction to Heat and Mass Transfer. Week 9
Introduction to Heat and Mass Transfer Week 9 補充! Multidimensional Effects Transient problems with heat transfer in two or three dimensions can be considered using the solutions obtained for one dimensional
More information2, where dp is the constant, R is the radius of
Dynamics of Viscous Flows (Lectures 8 to ) Q. Choose the correct answer (i) The average velocity of a one-dimensional incompressible fully developed viscous flow between two fixed parallel plates is m/s.
More information( ) PROBLEM C 10 C 1 L m 1 50 C m K W. , the inner surface temperature is. 30 W m K
PROBLEM 3. KNOWN: Temperatures and convection coefficients associated with air at the inner and outer surfaces of a rear window. FIND: (a) Inner and outer window surface temperatures, T s,i and T s,o,
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 informationECH 4224L Unit Operations Lab I Thin Film Evaporator. Introduction. Objective
Introduction In this experiment, you will use thin-film evaporator (TFE) to separate a mixture of water and ethylene glycol (EG). In a TFE a mixture of two fluids runs down a heated inner wall of a cylindrical
More information11.1 Mass Density. Fluids are materials that can flow, and they include both gases and liquids. The mass density of a liquid or gas is an
Chapter 11 Fluids 11.1 Mass Density Fluids are materials that can flow, and they include both gases and liquids. The mass density of a liquid or gas is an important factor that determines its behavior
More informationUNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics
UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics Physics 111.6 MIDTERM TEST #3 January 24, 2008 Time: 90 minutes NAME: (Last) Please Print (Given) STUDENT NO.: LECTURE SECTION (please
More informationExternal Forced Convection :
External Forced Convection : Flow over Bluff Objects (Cylinders, Spheres, Packed Beds) and Impinging Jets Chapter 7 Sections 7.4 through 7.8 7.4 The Cylinder in Cross Flow Conditions depend on special
More informationHEAT TRANSFER BY CONVECTION. Dr. Şaziye Balku 1
HEAT TRANSFER BY CONVECTION Dr. Şaziye Balku 1 CONDUCTION Mechanism of heat transfer through a solid or fluid in the absence any fluid motion. CONVECTION Mechanism of heat transfer through a fluid in the
More informationTOPIC 2 [A] STEADY STATE HEAT CONDUCTION
TOPIC 2 [A] STEADY STATE HEAT CONDUCTION CLASS TUTORIAL 1. The walls of a refrigerated truck consist of 1.2 mm thick steel sheet (k=18 W/m-K) at the outer surface, 22 mm thick cork (k=0.04 W/m-K) on the
More informationChapter 10: Steady Heat Conduction
Chapter 0: Steady Heat Conduction In thermodynamics, we considered the amount of heat transfer as a system undergoes a process from one equilibrium state to another hermodynamics gives no indication of
More information