Unformatted text preview: time. Why??? (b) For an initial solid temperature T i , derive the temperature in the solid as a function of time and the total heat transfer rate. 3. An aluminum cube 5 cm on a side is initially at uniform temperature 100°C and is suddenly exposed to room air at 25°C. The convective heat transfer coefficient is 20 W/m 2 •K. Calculate the time required for the geometric center temperature to reach 50°C. 4. Beginning with a differential control volume, derive the general unsteady conduction equation in Cartesian coordinates for constant properties....
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 Fall '08
 Kuznetsov
 Heat, Heat Transfer, 5 cm, 25°C, 50 mm, 20 W

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