An airfoil with a characteristic length of 0.2 ft is placed in airflow at 1 atm and 60°F w...

An airfoil with a characteristic length of 0.2 ft is placed in airflow at 1 atm and 60°F with free stream velocity of 150 ft/s and convection' heat transfer coefficient of 21 Btu/h-ft2·°F. If a second airfoil with a characteristic length of 0.4 ft is placed in the airflow at 1 atm and 60°F with free stream velocity of 75 ft/s, determine the heat flux from the second airfoil. Both airfoils are maintained at a constant surface temperature of 180°F.

Answer.-1260 Btu/h -fr

FIGURE P6·-59E