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Question: the steadystate expression for heat conduction through a plane wall...

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The steady-state expression for heat conduction through a plane wall is q = (kALAT as given by equation (17-4). For steady-state heat conduction through a hollow cylinder, an expression similar to equation (17-4) is: kA where ג is the log-mean area defined as: (a) Show that A as defined above satisfies the equations for steady-state radial heat transfer in a hollow cylindrical element (b) If the arithmetic mean area, π(ro-r), is used rather than the logarithmic mean, calculate the resulting percent error for values of rorof 1.5, 3, and 5
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