Chapter 6, Problem 6.28P

Experiments have shown that, for airflow at $T_{\infty }=35°\text{C}$ and $V_1=100\text{m/s,}$ the rate of heat transfer from a turbine blade of characteristic length $L_1=0.15\text{m}$ and surface temperature $T_{s,1}=300°\text{C}$ is $q_1=1500\text{W}\text{.}$ What would be the heat transfer rate from a second turbine blade of characteristic length $L_2=0.3\text{m}$ operating at $T_{s,2}=400°\text{C}$ in airflow of $T_{\infty }=35°\text{C}$ and $V_2=50\text{m/s?}$ The surface area of the blade may be assumed to be directly proportional to its characteristic length.