A thermocouple (TC) reads a temperature of 180 degrees C when placed in a large wind...

A thermocouple (TC) reads a temperature of 180 degrees C when placed in a large wind tunnel. The thermocouple is exposed to convection and radiation heat transfer.

The convection heat transfer coefficient h = 125 W/m²-K.
As for radiation, the surface of the thermocouple is diffuse and gray with an emissivity of 0.6. The walls of the wind tunnel are at a uniform temperature of 450 degrees C.

Questions:

Provide a sketch
State your assumptions
Calculate the temperature of the air in the wind tunnel
The walls of the duct have an emissivity of 0.85. Explain in one or two sentences why the emissivity of the walls should (or should not) have an effect on your answer?

Expert Solution

Answer(a) sketch of wind tunnel is given below

Answer(b) assumption is given below

Answer(c) temperature of the air in the wind tunnel(T1)= 509.08K = 236.08 degree Celsius

Answer(d) explanation of why the emissivity of the walls should have an effect is given below

samet mamat answered 2 months ago

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