Question

A steel ball of 50 mm diameter initially at 400oc is suddenly placed in a controlled environment at 100oc. The convective heat transfer coefficient is 15 w/m2k.Calculate the time required to attain the temperature of 180oc. For steel k=30w/m2 k. Cp=0.42 kj/kg k and density =7800 kg/m3.

Answer 1

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