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Question

Gas at atmospheric pressure and 40oC flows with a velocity is 5m/s over a 2m long flat plate whose surface is kept at a uniform temperature of 120oC. The average heat transfer coefficient (in W/m2oC) over the 2m length of the plate if the properties of gas at mean film temperature are
Kinematic viscosity = 2.107×105m2/s,
Thermal conductivity = 0.03025 W/mK,
Prandtl number = 0.6965.
Average Nussult number = Nu = 0.664Re0.5.
Pr0.3....For Laminar flow
Average Nussult number = Nu = 0.0375
Re0.8.Pr0.3....For turbulent flow

A
410
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B
3.1
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C
17.68
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D
6.2
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Solution

The correct option is D 6.2
Re=VLv=5×22.107×105

=4.746×105<5×105(laminar flow)

For laminar flow,

¯¯¯¯¯¯¯¯Nu=¯¯¯hLK=0.664 Re0.5Pr0.3

¯¯¯h×20.03025=0.664(4.746×105)0.5(0.6965)0.3

¯¯¯h=6.2W/m2K

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