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Conduction involves the transfer of heat by
the interaction between adjacent molecules of a material.
Heat transfer by conduction is dependent upon the driving
"force" of temperature difference
and the resistance to heat transfer. The resistance to heat
transfer is dependent upon the
nature and dimensions of the heat transfer medium. All heat
transfer problems involve the temperature
difference, the geometry, and the physical properties of the
object being studied. In
conduction heat transfer problems, the object being studied
is usually a solid. Convection problems
involve a fluid medium. Radiation heat transfer problems
involve either solid or fluid surfaces,
separated by a gas, vapor, or vacuum. There are several ways
to correlate the geometry, physical
properties, and temperature difference of an object with the
rate of heat transfer through the
object. In conduction heat transfer, the most common means of
correlation is through Fourier’s
Law of Conduction. The law, in its equation form, is used
most often in its rectangular or
cylindrical form (pipes and cylinders), both of which are
presented below.
The use of Equations above in determining the
amount of heat transferred by conduction is
demonstrated in the examples given by Conduction-Rectangular
Coordinates.
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