Chapter 4 Transient Heat Conduction
Transient 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
Chapter 4 Transient Heat Conduction
Chapter 4
TRANSIENT HEAT CONDUCTION
Lumped System Analysis
4-1C 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
Chapter 3 Steady Heat Conduction
Review Problems
3-152E 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
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BOILING AND
C O N D E N S AT I O N
e know from thermodynamics that when the temperature of a liquid
at a specified pressure is raised to the saturation temperature Tsat at
that pressure, boiling occurs.
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R A D I AT I O N H E AT T R A N S F E R
n Chapter 11, we considered the fundamental aspects of radiation and the
radiation properties of surfaces. We are now in a position to consider
radiation exchange
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F U N D A M E N TA L S O F
T H E R M A L R A D I AT I O N
o far, we have considered the conduction and convection modes of heat
transfer, which are related to the nature of the materials involved and
the
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EXTERNAL FORCED
CONVECTION
n Chapter 6 we considered the general and theoretical aspects of forced
convection, with emphasis on differential formulation and analytical solutions. In this chapter we cons
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N AT U R A L C O N V E C T I O N
n Chapters 7 and 8, we considered heat transfer by forced convection,
where a fluid was forced to move over a surface or in a tube by external
means such as a pump or a
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INTERNAL FORCED
CONVECTION
iquid or gas flow through pipes or ducts is commonly used in heating and
cooling applications. The fluid in such applications is forced to flow by a
fan or pump through a tube
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NUMERICAL METHODS
I N H E AT C O N D U C T I O N
o far we have mostly considered relatively simple heat conduction problems involving simple geometries with simple boundary conditions because only such
Chapter 4 Transient Heat Conduction
Transient Heat Conduction in Multidimensional Systems
4-69C The product solution enables us to determine the dimensionless temperature of two- or threedimensional heat transfer problems as the product of dimensionless t
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
Chapter 10 Boiling and Condensation
Condensation Heat Transfer
10-34C 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
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
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
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
Chapter 10 Boiling and Condensation
Chapter 10
BOILING AND CONDENSATION
Boiling Heat Transfer
10-1C 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
Chapter 5 Numerical Methods in Heat Conduction
Chapter 5
NUMERICAL METHODS IN HEAT CONDUCTION
Why Numerical Methods
5-1C Analytical solution methods are limited to highly simplified problems in simple geometries . The
geometry must be such that its entire
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
Chapter 4 Transient Heat Conduction
Review Problems
4-105 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
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
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
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S T E A D Y H E AT C O N D U C T I O N
n heat transfer analysis, we are often interested in the rate of heat transfer
through a medium under steady conditions and surface temperatures. Such
problems can
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F U N D A M E N TA L S O F
CONVECTION
o far, we have considered conduction, which is the mechanism of heat
transfer through a solid or a quiescent fluid. We now consider convection, which is the mechani
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H E AT E X C H A N G E R S
eat exchangers are devices that facilitate the exchange of heat between
two fluids that are at different temperatures while keeping them from
mixing with each other. Heat excha