Two large parallel plates are separated from one another by 30 μm. The space between plates is filled with stagnant helium at 0.2 bar pressure. The surface temperature of one plate is 150°C, while the...

Two large parallel plates are separated from one another by 30 μm. The space between plates is filled with stagnant helium at 0.2 bar pressure. The surface temperature of one plate is 150°C, while the surface temperature of the other plate is 130°

a. Is rarefaction important?

b. Find the temperature distribution in the helium layer and heat transfer rate between the two plates in kilowatts per square meter, considering the rarefaction effect. Calculate the temperature jump at each surface.

c. Repeat Part b, this time neglecting the effect of rarefaction. Compare the results with the results of Part b