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Course: AET AET438, Spring 2009School: ASU
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ASU - AET - AET438
ASU - AET - AET438
ASU - AET - AET438
ASU - AET - AET438
ASU - AET - AET438
ASU - MET - MET331
ASU - MET - MET331
ASU - MET - MET331
ASU - MET - MET331
ASU - MET - MET331
ASU - MET - MET331
ASU - AET - AET432
Chapter 15 Cooling of Electronic Equipment 15-140 A multilayer circuit board consisting of four layers of copper and three layers of glass-epoxy sandwiched together is considered. The magnitude and location of the maximum temperature that occurs in the PC
ASU - AET - AET432
Chapter 12 Radiation Heat TransferChapter 12 RADIATION HEAT TRANSFERView Factors12-1C The view factor Fijrepresents the fraction of the radiation leaving surface i that strikes surface jdirectly. The view factor from a surface to itself is non-zero
ASU - AET - AET432
Chapter 12 Radiation Heat Transfer 12-41 A circular grill is considered. The bottom of the grill is covered with hot coal bricks, while the wire mesh on top of the grill is covered with steaks. The initial rate of radiation heat transfer from coal bricks
ASU - AET - AET432
Chapter 12 Radiation Heat TransferSpecial Topic: Heat Transfer from the Human Body12-74C Yes, roughly one-third of the metabolic heat generated by a person who is resting or doing light work is dissipated to the environment by convection, one-third by e
ASU - AET - AET432
Chapter 12 Radiation Heat TransferReview Problems 12-88 The temperature of air in a duct is measured by a thermocouple. The radiation effect on the temperature measurement is to be quantified, and the actual air temperature is to be determined. Assumptio
ASU - AET - AET432
Chap 13 Heat ExchangersChapter 13 HEAT EXCHANGERSTypes of Heat Exchangers13-1C Heat exchangers are classified according to the flow type as parallel flow, counter flow, and crossflow arrangement. In parallel flow, both the hot and cold fluids enter the
ASU - AET - AET432
Chap 15 Heat ExchangersThe Log Mean Temperature Difference Method13-32C Tlm is called the log mean temperature difference, and is expressed asTlm T1 T2 ln( T1 / T2 )whereT1 = Th,in - Tc,inT = Th,in - Tc,outT2 = Th,out - Tc,outT2 = Th,out - Tc,inf
ASU - AET - AET432
Chap 15 Heat Exchangers 13-54 Glycerin is heated by ethylene glycol in a thin-walled double-pipe parallel-flow heat exchanger. The rate of heat transfer, the outlet temperature of the glycerin, and the mass flow rate of the ethylene glycol are to be deter
ASU - AET - AET432
Chap 13 Heat ExchangersThe Effectiveness-NTU Method13-68C When the heat transfer surface area A of the heat exchanger is known, but the outlet temperatures are not, the effectiveness-NTU method is definitely preferred.13-69C The effectiveness of a heat
ASU - AET - AET432
Chap 13 Heat Exchangers 13-95 Cold water is heated by hot water in a heat exchanger. The net rate of heat transfer and the heat transfer surface area of the heat exchanger are to be determined. Assumptions 1 Steady operating conditions exist. 2 The heat e
ASU - AET - AET432
Chap 13 Heat ExchangersReview Problems13-111 Hot oil is cooled by water in a multi-pass shell-and-tube heat exchanger. The overall heat transfer coefficient based on the inner surface is to be determined. Assumptions 1 Water flow is fully developed. 2 P
ASU - AET - AET432
Chapter 14 Mass TransferChapter 14 MASS TRANSFERMass Transfer and Analogy Between Heat and Mass Transfer14-1C Bulk fluid flow refers to the transportation of a fluid on a macroscopic level from one location to another in a flow section by a mover such
ASU - AET - AET432
Chapter 14 Mass TransferSteady Mass Diffusion Through a Wall14-42C The relations for steady one-dimensional heat conduction and mass diffusion through a plane wall are expressed as follows: Heat conduction: Mass diffusion: Qcond mdiff,A,wallkAT1 T2
ASU - AET - AET432
Chapter 14 Mass TransferDiffusion in a Moving Medium14-74C The mass-average velocity of a medium at some location is the average velocity of the mass at that location relative to an external reference point. It is the velocity that would be measured by
ASU - AET - AET432
Chapter 14 Mass Transfer 14-107 A raindrop is falling freely in atmospheric air. The terminal velocity of the raindrop at which the drag force equals the weight of the drop and the average mass transfer coefficient are to be determined. Assumptions 1 The
ASU - AET - AET432
Chapter 14 Mass Transfer 14-119 A person is standing outdoors in windy weather. The rates of heat loss from the head by radiation, forced convection, and evaporation are to be determined for the cases of the head being wet and dry. Assumptions 1 The low m
ASU - AET - AET432
Chapter 14 Mass Transfer 14-134 A circular pan filled with water is cooled naturally. The rate of evaporation of water, the rate of heat transfer by natural convection, and the rate of heat supply to the water needed to maintain its temperature constant a
ASU - AET - AET432
Chapter 15 Cooling of Electronic EquipmentChapter 15 COOLING OF ELECTRONIC EQUIPMENTIntroduction and History15-1C The invention of vacuum diode started the electronic age. The invention of the transistor marked the beginning of a revolution in that age
ASU - AET - AET432
Chapter 15 Cooling of Electronic Equipment 15-55 A plastic DIP with 16 leads is cooled by forced air. Using data supplied by the manufacturer, the junction temperature is to be determined. Assumptions Steady operating conditions exist. Analysis The juncti
ASU - AET - AET432
Chapter 15 Cooling of Electronic Equipment Air Cooling: Natural Convection and Radiation 15-71C As the student watches the movie, the temperature of the electronic components in the VCR will keep increasing because of the blocked air passages. The VCR eve
ASU - AET - AET432
Chapter 15 Cooling of Electronic EquipmentAir Cooling: Forced Convection15-94C Radiation heat transfer in forced air cooled systems is usually disregarded with no significant error since the forced convection heat transfer coefficient is usually much la
ASU - AET - AET432
Chapter 3 Steady Heat ConductionReview Problems3-152E Steam is produced in copper tubes by heat transferred from another fluid condensing outside the tubes at a high temperature. The rate of heat transfer per foot length of the tube when a 0.01 in thick
ASU - AET - AET432
Chapter 1 Basics of Heat TransferChapter 1 BASICS OF HEAT TRANSFERThermodynamics and Heat Transfer 1-1C Thermodynamics deals with the amount of heat transfer as a system undergoes a process from one equilibrium state to another. Heat transfer, on the ot
ASU - AET - AET432
Chapter 1 Basics of Heat TransferHeat Transfer Mechanisms1-44C The thermal conductivity of a material is the rate of heat transfer through a unit thickness of the material per unit area and per unit temperature difference. The thermal conductivity of a
ASU - AET - AET432
Chapter 1 Basics of Heat Transfer 1-87E A 200-ft long section of a steam pipe passes through an open space at a specified temperature. The rate of heat loss from the steam pipe and the annual cost of this energy lost are to be determined. Assumptions 1 St
ASU - AET - AET432
Chapter 1 Basics of Heat TransferReview Problems1-121 Cold water is to be heated in a 1200-W teapot. The time needed to heat the water is to be determined. Assumptions 1 Steady operating conditions exist. 2 Thermal properties of the teapot and the water
ASU - AET - AET432
Chapter 2 Heat Conduction EquationChapter 2 HEAT CONDUCTION EQUATIONIntroduction2-1C Heat transfer is a vector quantity since it has direction as well as magnitude. Therefore, we must specify both direction and magnitude in order to describe heat trans
ASU - AET - AET432
Chapter 2 Heat Conduction EquationSolution of Steady One-Dimensional Heat Conduction Problems2-52C Yes, this claim is reasonable since in the absence of any heat generation the rate of heat transfer through a plain wall in steady operation must be const
ASU - AET - AET432
Chapter 2 Heat Conduction Equation 2-68 A compressed air pipe is subjected to uniform heat flux on the outer surface and convection on the inner surface. The mathematical formulation, the variation of temperature in the pipe, and the surface temperatures
ASU - AET - AET432
Chapter 2 Heat Conduction EquationVariable Thermal Conductivity2-94C During steady one-dimensional heat conduction in a plane wall, long cylinder, and sphere with constant thermal conductivity and no heat generation, the temperature in only the plane wa
ASU - AET - AET432
Chapter 2 Heat Conduction Equation 2-126 A spherical liquid nitrogen container is subjected to specified temperature on the inner surface and convection on the outer surface. The mathematical formulation, the variation of temperature, and the rate of evap
ASU - AET - AET432
Chapter 3 Steady Heat ConductionChapter 3 STEADY HEAT CONDUCTIONSteady Heat Conduction In Plane Walls 3-1C (a) If the lateral surfaces of the rod are insulated, the heat transfer surface area of the cylindrical rod is the bottom or the top surface area
ASU - AET - AET432
Chapter 15 Steady Heat Conduction Thermal Contact Resistance 3-39C The resistance that an interface offers to heat transfer per unit interface area is called thermal contact resistance, Rc . The inverse of thermal contact resistance is called the thermal
ASU - AET - AET432
Chapter 15 Steady Heat ConductionHeat Conduction in Cylinders and Spheres3-64C When the diameter of cylinder is very small compared to its length, it can be treated as an indefinitely long cylinder. Cylindrical rods can also be treated as being infinite
ASU - AET - AET432
Chapter 15 Steady Heat ConductionCritical Radius Of Insulation 3-83C In a cylindrical pipe or a spherical shell, the additional insulation increases the conduction resistance of insulation, but decreases the convection resistance of the surface because o
ASU - AET - AET432
Chapter 3 Steady Heat Conduction Heat Transfer In Common Configurations 3-120C Under steady conditions, the rate of heat transfer between two surfaces is expressed as Q Sk (T1 T2 ) where S is the conduction shape factor. It is related to the thermal resis
ASU - AET - AET432
Chapter 3 Steady Heat Conduction 3-164 A circuit board houses electronic components on one side, dissipating a total of 15 W through the backside of the board to the surrounding medium. The temperatures on the two sides of the circuit board are to be dete
ASU - AET - AET432
Chapter 4 Transient Heat ConductionChapter 4 TRANSIENT HEAT CONDUCTIONLumped System Analysis4-1C In heat transfer analysis, some bodies are observed to behave like a "lump" whose entire body temperature remains essentially uniform at all times during a
ASU - AET - AET432
Chapter 4 Transient Heat ConductionTransient Heat Conduction in Large Plane Walls, Long Cylinders, and Spheres 4-26C A cylinder whose diameter is small relative to its length can be treated as an infinitely long cylinder. When the diameter and length of
ASU - AET - AET432
Chapter 4 Transient Heat Conduction 4-47 A hot dog is dropped into boiling water, and temperature measurements are taken at certain time intervals. The thermal diffusivity and thermal conductivity of the hot dog and the convection heat transfer coefficien
ASU - AET - AET432
Chapter 4 Transient Heat ConductionTransient Heat Conduction in Multidimensional Systems4-69C The product solution enables us to determine the dimensionless temperature of two- or threedimensional heat transfer problems as the product of dimensionless t
ASU - AET - AET432
Chapter 4 Transient Heat Conduction 4-81 A cubic block and a cylindrical block are exposed to hot gases on all of their surfaces. The center temperatures of each geometry in 10, 20, and 60 min are to be determined. Assumptions 1 Heat conduction in the cub
ASU - AET - AET432
Chapter 4 Transient Heat ConductionReview Problems4-105 Two large steel plates are stuck together because of the freezing of the water between the two plates. Hot air is blown over the exposed surface of the plate on the top to melt the ice. The length
ASU - AET - AET432
Chapter 4 Transient Heat Conduction 4-118 Internal combustion engine valves are quenched in a large oil bath. The time it takes for the valve temperature to drop to specified temperatures and the maximum heat transfer are to be determined. Assumptions 1 T
ASU - AET - AET432
Chapter 5 Numerical Methods in Heat ConductionChapter 5 NUMERICAL METHODS IN HEAT CONDUCTIONWhy Numerical Methods 5-1C Analytical solution methods are limited to highly simplified problems in simple geometries. The geometry must be such that its entire
ASU - AET - AET432
Chapter 5 Numerical Methods in Heat Conduction 5-29 A plate is subjected to specified heat flux and specified temperature on one side, and no conditions on the other. The finite difference formulation of this problem is to be obtained, and the temperature
ASU - AET - AET432
Chapter 5 Numerical Methods in Heat ConductionTwo-Dimensional Steady Heat Conduction5-43C For a medium in which the finite difference formulation of a general interior node is given in its g node l 2 simplest form as Tleft Ttop Tright Tbottom 4Tnode 0:
ASU - AET - AET432
Chapter 5 Numerical Methods in Heat ConductionTransient Heat Conduction5-63C The formulation of a transient heat conduction problem differs from that of a steady heat conduction problem in that the transient problem involves an additional term that repr
ASU - AET - AET432
Chapter 5 Numerical Methods in Heat Conduction 5-84 A uranium plate initially at a uniform temperature is subjected to insulation on one side and convection on the other. The transient finite difference formulation of this problem is to be obtained, and t
ASU - AET - AET432
Chapter 5 Numerical Methods in Heat ConductionSpecial Topic: Controlling the Numerical Error5-96C The results obtained using a numerical method differ from the exact results obtained analytically because the results obtained by a numerical method are ap