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Air enters a rectangular duct measuring 40 cm by 50 cm with a velocity of 8.5...

Air enters a rectangular duct measuring 40 cm by 50 cm with a velocity of 8.5 m/s and a temperature of 50 degree Celsius. The flowing air has a thermal conductivity 0.03 W/m K, kinematic viscosity (16.95*10^-6) m2/s and from empirical correlations the Nusselt number has been approximated to be 425. find the convective heat flow coefficient.

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