WHAT IS HEAT TRANSFER?
HEAT TRANSFER MODES AND RATES
WHAT IS HEAT TRANSFER?
Heat transfer (or heat) is thermal energy in transit due to a spatial
temperature difference
Whenever a temperature difference exists in a medium or between
media, heat transfer m

1D, SS CONDUCTION
THE PLANE WALL
THE PLANE WALL
Despite their inherent simplicity, onedimensional, steady-state models may be
used to accurately represent numerous
engineering systems
The term one-dimensional refers to the
fact that only one coordinate is

1D, SS CONDUCTION
EXTENDED SURFACES
EXTENDED SURFACES
The term extended surface is commonly
used to depict an important special
case involving heat transfer by
conduction within a solid and heat
transfer by convection (and/or
radiation) from the boundarie

CONDUCTION WITH THERMAL
ENERGY GENERATION
PLANE WALL AND RADIAL SYSTEMS
CONDUCTION WITH ENERGY GENERATION
We now want to consider the
additional effect on the
temperature distribution of
processes that may be occurring
within the medium
In particular, we

1D, SS CONDUCTION
HOLLOW CYLINDER
RADIAL SYSTEMS
Cylindrical and spherical systems
often experience temperature
gradients in the radial direction
only and may therefore be
treated as one-dimensional
Under steady-state conditions
with no heat generation, s

LETS PRACTICE!
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CONDUCTION
HEAT DIFFUSION EQUATION
HEAT EQUATION
A major objective in a conduction
analysis is to determine the
temperature field in a medium
resulting from conditions imposed
on its boundaries
That is, we wish to know the
temperature distribution, which

CONDUCTION
FOURIERS LAW
FOURIERS LAW
Conduction is the transport of energy in
a medium due to a temperature
gradient, and the physical mechanism
is one of random atomic or molecular
activity
Conduction heat transfer is governed
by Fouriers law:
q = kT
Fou

Golf Ball Constmction, Riddell Helmets & Crosiite Material
Cross Over by Kim Baker & Jerry Jansen
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