Experiments have shown that, for airflow at = 35°c and = 100 m/s, the rate of heat transfer ∞1 from a turbine blade of characteristic length l1 = 0.15 m and surface temperature = 300°c is =1500 w. what would be the heat transfer rate from a second turbine blade of characteristic length l2 = 0.3 m operating at = 400°c in airflow of = 35°c and v2 = 50 m/s? the surface area of the ∞ blade may be assumed to be directly proportional to its characteristic length.