Question

The average heat transfer coefficient for flow of 100°C air over a flat
plate is measured by observing the temperature time history of a 3 cm thick
copper slab exposed to 100°C air
. In one test tun, the initial temperature of
the plate was 210°C, and in 5 minutes the temperature decreased by 40°C.
Calculate the heat transfer coefficient for this case.
Solution. Taking the property values of copper as in Example 5.2.
Thickness of plate = 21 0.03 m; L. = L = 0.015 m​

Answer 1

Explanation:

4 An average convective heat transfer coefficient for flow of 100 °C air over a flat plate is measured by observing the temperature-time history of a 30 mm thick copper slab (p =9000 kg/m2, e air. In one test run, the initial temperature of the plate was 210 °C, and in 5 minutes the temperature decreased by 40°C. Find the heat transfer coefficient for this case. Neglect internal thermal resistance. [Ans. 77 24 W/m2 °C] c 0.38 kJ/kg °C, k-370 W/m°C). exposed to 100 °C

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