Question

Air at p = 1 atm enters a thin walled (D = 5mm diameter) long tube (L = 2 in) at an inlet temperature of Tmr100 °C. A constant heat flux is applied to the air from the tube surface. The mass flow rate of air is in = 135x le kg/s.
Properties of air (at 400 K): g = 230.1x10-7 N.s/m2, Pr = 0.690, k = 0.0338 W/m.K, Cp = 1014 J/kg.K

Choose the closest value of the local heat transfer coefficient at the tube exit. [Hint: For fully developed laminar flow with constant heat flux conditions, the Nusselt number is 4.36]
a. 29.5 W/m2.K
b. 67.9 W/m2.K
c. 105.7 W/m2.K
d. 10.9 W/m2.K

Answer 1

Answer:

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