Air, at an inlet pressure of 80 kPa and an inlet temperature of 300 K, flows through a long circular cross-section tube with a surface temperature of 350 K. The air velocity at the inlet is 8 m/s.
a. Based on inlet conditions, find the tube diameter that defines the threshold between continuum and slip flow regimes.
b. Consider a tube whose diameter is 1/2 of the threshold diameter calculated in Part a and has a length-to-diameter ratio of 200. Calculate the pressure drop, the total heat transfer rate to the air, and the tube surface temperature at exit assuming fully developed flow and neglecting compressibility effect.
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