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18 Pages

### Heat Chap02-001

Course: AET AET432, Spring 2007
School: ASU
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Word Count: 5662

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2 Chapter Heat Conduction Equation Chapter 2 HEAT CONDUCTION EQUATION Introduction 2-1C 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 transfer completely at a point. Temperature, on the other hand, is a scalar quantity. 2-2C The term steady implies no change with time at any point within the medium...

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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 &quot;lump&quot; 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
ASU - AET - AET432
Chapter 6 Fundamentals of ConvectionChapter 6 FUNDAMENTALS OF CONVECTIONPhysical Mechanisms of Forced Convection 6-1C In forced convection, the fluid is forced to flow over a surface or in a tube by external means such as a pump or a fan. In natural con
ASU - AET - AET432
Chapter 6 Fundamentals of Convection 6-39 The oil in a journal bearing is considered. The velocity and temperature distributions, the maximum temperature, the rate of heat transfer, and the mechanical power wasted in oil are to be determined. Assumptions
ASU - AET - AET432
Chapter 7 External Forced ConvectionChapter 7 EXTERNAL FORCED CONVECTIONDrag Force and Heat Transfer in External Flow 7-1C The velocity of the fluid relative to the immersed solid body sufficiently far away from a body is called the free-stream velocity
ASU - AET - AET432
Chapter 7 External Forced ConvectionFlow Across Cylinders And Spheres 7-35C For the laminar flow, the heat transfer coefficient will be the highest at the stagnation point which corresponds to 0 . In turbulent flow, on the other hand, it will be highest
ASU - AET - AET432
Chapter 7 External Forced Convection 7-52 A steam pipe is exposed to a light winds in the atmosphere. The amount of heat loss from the steam during a certain period and the money the facility will save a year as a result of insulating the steam pipe are t
ASU - AET - AET432
Chapter 7 External Forced Convection Special Topic: Thermal Insulation 7-73C Thermal insulation is a material that is used primarily to provide resistance to heat flow. It differs from other kinds of insulators in that the purpose of an electrical insulat
ASU - AET - AET432
Chapter 7 External Forced Convection 7-99 Wind is blowing over the roof of a house. The rate of heat transfer through the roof and the cost of this heat loss for 14-h period are to be determined. Assumptions 1 Steady operating conditions exist. 2 The crit
ASU - AET - AET432
Chapter 8 Internal Forced ConvectionChapter 8 INTERNAL FORCED CONVECTIONGeneral Flow Analysis 8-1C Liquids are usually transported in circular pipes because pipes with a circular cross-section can withstand large pressure differences between the inside
ASU - AET - AET432
Chapter 8 Internal Forced Convection 8-53 Hot air enters a sheet metal duct located in a basement. The exit temperature of hot air and the rate of heat loss are to be determined. Assumptions 1 Steady flow conditions exist. 2 The inner surfaces of the duct
ASU - AET - AET432
Chapter 8 Internal Forced ConvectionReview Problems 8-61 Geothermal water is supplied to a city through stainless steel pipes at a specified rate. The electric power consumption and its daily cost are to be determined, and it is to be assessed if the fri
ASU - AET - AET432
Chapter 9 Natural ConvectionChapter 9 NATURAL CONVECTIONPhysical Mechanisms of Natural Convection 9-1C Natural convection is the mode of heat transfer that occurs between a solid and a fluid which moves under the influence of natural means. Natural conv
ASU - AET - AET432
Chapter 9 Natural Convection 9-32 A fluid flows through a pipe in calm ambient air. The pipe is heated electrically. The thickness of the insulation needed to reduce the losses by 85% and the money saved during 10-h are to be determined. Assumptions 1 Ste
ASU - AET - AET432
Chapter 9 Natural ConvectionCombined Natural and Forced Convection 9-72C In combined natural and forced convection, the natural convection is negligible when Gr / Re2 01 . Otherwise it is not. . 9-73C In assisting or transverse flows, natural convection
ASU - AET - AET432
Chapter 9 Natural ConvectionReview Problems 9-94E A small cylindrical resistor mounted on the lower part of a vertical circuit board. The approximate surface temperature of the resistor is to be determined. Assumptions 1 Steady operating conditions exist
ASU - AET - AET432
Chapter 9 Natural Convection 9-103E The components of an electronic device located in a horizontal duct of rectangular cross section is cooled by forced air. The heat transfer from the outer surfaces of the duct by natural convection and the average tempe
ASU - AET - AET432
Chapter 10 Boiling and CondensationChapter 10 BOILING AND CONDENSATIONBoiling Heat Transfer10-1C Boiling is the liquid-to-vapor phase change process that occurs at a solid-liquid interface when the surface is heated above the saturation temperature of
ASU - AET - AET432
Chapter 10 Boiling and Condensation 10-21 Water is boiled at 1 atm pressure and thus at a saturation (or boiling) temperature of Tsat = 100 C by a horizontal nickel plated copper heating element. The maximum (critical) heat flux and the temperature jump o
ASU - AET - AET432
Chapter 10 Boiling and CondensationCondensation Heat Transfer10-34C Condensation is a vapor-to-liquid phase change process. It occurs when the temperature of a vapor is reduced below its saturation temperature Tsat. This is usually done by bringing the
ASU - AET - AET432
Chapter 10 Boiling and Condensation Review Problems 10-72 Steam at a saturation temperature of Tsat = 40 C condenses on the outside of a thin horizontal tube. Heat is transferred to the cooling water that enters the tube at 25 C and exits at 35 C. The rat
ASU - AET - AET432
Chapter 11 Fundamentals of Thermal RadiationChapter 11 FUNDAMENTALS OF THERMAL RADIATIONElectromagnetic and Thermal Radiation11-1C Electromagnetic waves are caused by accelerated charges or changing electric currents giving rise to electric and magneti
ASU - AET - AET432
Chapter 11 Fundamentals of Thermal RadiationAtmospheric and Solar Radiation11-50C The solar constant represents the rate at which solar energy is incident on a surface normal to sun's rays at the outer edge of the atmosphere when the earth is at its mea
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Commentary on Lecture 7Feb. 3, 2009Osteoporosis is a name that literally means &quot; bones with holes&quot; which, of course, weakens them. There are two forms of this partially nutritional, partially environmental disease. The one that affects very young childr
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