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Solution of BLE for Internal Flows

A fluid of th...

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 ( $W / m^{2} K$ ) ?

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.
$N u = 3.66$
also $N u = \frac{h D}{k}, h = \frac{N u k}{D} = \frac{3.66 \times 5}{0.2} = 91.5 W / m^{2} K$

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