Chapter 8, Problem 8.78P

For a sharp-edged inlet and a combined entry region, the average Nusselt number may be computed from Equation 8.63, with $C=24{\mathrm{Re}}_D^{-0.23}$ and $m=0.815-2.08\times {10}^{-6}{\mathrm{Re}}_D[23]$ . Determine $N_{uD}/N_{uD}{.}_{\text{fd}}$ at $x/D=10$ and 60 for ${\mathrm{Re}}_D={10}^4$ and ${10}^5$ .