A composite cylindrical wall is composed of two materials of thermal conductivity kA, and kB, which are separated by a very thin, electric resistance heater for which interfacial contact resistances are negligible. Liquid pumped through the tube is at a temperature Too,i and provides a convection coefficient h; at the inner surface of the composite. The outer surface is exposed to ambient air, which is at Too,o and provides a convection coefficient of ho. Under steady-state conditions, a uniform heat flux of q"h is dissipated by the heater, where the reference area for this heat flux is the heater surface area. Any radiation effects can be neglected. Sketch the equivalent thermal circuit for this system then use your circuit to develop an expression for q''h in terms of other important variables/parameters of the system. .
A composite cylindrical wall is composed of two materials of thermal conductivity kA, and
kB, which are separated by a very thin, electric resistance heater for which interfacial
contact resistances are negligible. Liquid pumped through the tube is at a temperature Too,i
and provides a convection coefficient h; at the inner surface of the composite. The outer
surface is exposed to ambient air, which is at Too,o and provides a convection coefficient of
ho. Under steady-state conditions, a uniform heat flux of q"h is dissipated by the heater,
where the reference area for this heat flux is the heater surface area. Any radiation effects
can be neglected.
Sketch the equivalent thermal circuit for this system then use your circuit to develop an
expression for q''h in terms of other important variables/parameters of the system. .
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