Air at p = 1 atm enters a thin-walled (D = 5 mm diameter) long tube...

 

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Air at p = 1 atm enters a thin-walled (D = 5 mm diameter) long tube (L = 2 m) at an inlet temperature of = 100°C. A constant heat flux is applied to the air from the tube surface. The air mass flowrate is %3D %3D Tm,i 135E-6 kg/s. a. If the tube surface temperature at the exit is 160°C, determine the heat rate entering the tube. Evaluate properties at 400 K. b. If the tube length of part (a) were reduced to L 0.2 m, how would flow conditions at the tube exit be affected? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part a? c. If the flow rate of part (a) were increased by a factor of 10, would there be a difference in flow conditions at the tube exit? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part a? Air at p = 1 atm enters a thin-walled (D = 5 mm diameter) long tube (L = 2 m) at an inlet temperature of = 100°C. A constant heat flux is applied to the air from the tube surface. The air mass flowrate is %3D %3D Tm,i 135E-6 kg/s. a. If the tube surface temperature at the exit is 160°C, determine the heat rate entering the tube. Evaluate properties at 400 K. b. If the tube length of part (a) were reduced to L 0.2 m, how would flow conditions at the tube exit be affected? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part a? c. If the flow rate of part (a) were increased by a factor of 10, would there be a difference in flow conditions at the tube exit? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part a?

Answer rating: 100% (QA)

Surface temperature of the tube at the exit T 160 C Properties of air at T 400 K are as follows De... View the full answer