a. Consider a square duct with a width and height of 6 μm and length of 100 μm. Air, at an inlet pressure of 1 bar and an inlet temperature of 300 K, flows through this tube with a constant surface...

a. Consider a square duct with a width and height of 6 μm and length of 100 μm. Air, at an inlet pressure of 1 bar and an inlet temperature of 300 K, flows through this tube with a constant surface heat flux of 50 kW/m²
. Air velocity at inlet is 180 m/s. Verify whether the slip flow regime applies to this problem.

b. Find
using Equations 13.7.15 and 13.8.1. Compare the results from these equations with Figure 13.15.

c. Find the mean temperature of the fluid and duct surface temperature at outlet.

 d. Find the heat transfer coefficient, hDh, if there is a constant surface temperature of 375 K instead of surface heat flux.