Based on an asymptotic interpolation technique, Awad (2010) derived the forthcoming expressions for hydrodynamically fully-developed flow and thermally developing flow in a flat channel with UHF...

Based on an asymptotic interpolation technique, Awad (2010) derived the forthcoming expressions for hydrodynamically fully-developed flow and thermally developing flow in a flat channel with UHF boundary conditions,

(a) For the flow conditions of Problem 4.29, assume that the channel boundary condition is UHF with q s = 100 W/m²
. Assuming ReDH = 100, for Pe = 60 and Pe = 10,000, calculate and tabulate the mean temperature Tm, and local Nusselt number, NuD,x, as a function of x, for x∗ ≤ 0.1. Plot Nu_DH,x and θm = Tm−Ts Tin−Ts as a function of 2x DhRe_DH
Pr for both cases. Using the calculated results determine the thermal entrance lengths.

(b) Write and discuss the equivalent mass transfer expressions.