Chapter 9, Problem 9.23P

Consider laminar flow about a vertical isothermal plate of length L, providing an average heat transfer coefficient of ${\bar{h}}_L$ . If the plate is divided into N smaller plates, each of length, $L_N=L/N$ , determine an expression for the ratio of the heat transfer coefficient averaged over the N plates to the heat transfer coefficient averaged over the single plate, ${\bar{h}}_{L,N}/{\bar{h}}_{L,1}$ .