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Air enters a thin-walled, 5-mm diameter, 2-m-long tube at a uniform inlet temperature of 100°C. A...

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Mechanical Engineering

Air enters a thin-walled, 5-mm diameter, 2-m-long tube at auniform inlet temperature of 100°C. A constant heat flux is appliedto the air from the tube surface. The mean temperature of air athalfway along the tube (at 1 m length) is reported as 126°C. If thetube surface temperature at the exit is 160°C and the local heattransfer coefficient at the exit is 29.5 W/m^2K, determine

a) the applied heat flux,

b) the rate of energy increase in air from the entrance to theexit of the tube,

c) the mass flow rate of air in the tube,

d) the local heat transfer coefficient at halfway along the tube(at 1 m length),

e) the surface temperature of the tube at halfway along the tube(at 1 m length).

Assume steady-state conditions and constant air properties.

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