Chapter 2
Heat Conduction Equation
Variable Thermal Conductivity
294C
During steady onedimensional heat conduction in a plane wall, long cylinder, and sphere with
constant thermal conductivity and no heat generation, the temperature in only the
plane wall
will vary
linearly.
295C
The thermal conductivity of a medium, in general, varies with temperature.
296C
During steady onedimensional heat conduction in a plane wall in which the thermal conductivity
varies linearly, the error involved in heat transfer calculation by assuming constant thermal conductivity at
the average temperature is (
a
)
none
.
297C
No, the temperature variation in a plain wall will not be linear when the thermal conductivity varies
with temperature.
298C
Yes, when the thermal conductivity of a medium varies linearly with temperature, the average
thermal conductivity is always equivalent to the conductivity value at the average temperature.
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Conductivity, Mass, Heat

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