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Question

A fluid of thermal conductivity 5 W/mK is flowing in a pipe of diameter 20 cm with a Reynolds number of 1500. The pipe is maintained at constant wall temperature. What will be the convective heat transfer coefficient (W/m2K) ?

A
91.5
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B
5.78
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C
4.36
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D
3.66
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Solution

The correct option is A 91.5
Since, Re < 2300 i.e. flow is laminar in pipe for laminar flow in a pipe with constant wall temperature.
Nu=3.66
also Nu=hDk,h=NukD=3.66×50.2=91.5 W/m2K

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