Experiments have shown that, for airflow at $T_{}=3DC$ and $V_1=1D0\frac{m}{s},$ the rate of heat transfer from a turbine blade of characteristic length $L_1=0\mathrm{.}15m$ and surface temperature $T_{s,1}=3D0C$ is $q_1=1D00W.$ What would be the heat transfer rate from a second turbine blade of characteristic length $L_2=0\mathrm{.}3m$ operating at $T_{s,2}=400C$ in airflow of $T_{}=3DC$ and $V_2=5D\frac{m}{s}?$ The surface area of the blade may be assumed to be directly proportional to its characteristic length.

D $=8$

D$=8$

D $=8$

THE VALUE OF D IS $8!!!!!!!$