An object of irregular shape has a characteristic length of 1 mand is maintained at a uniform surface temperature of 450 K. Whenplaced in atmospheric air at a temperature of T? 300 K and movingwith a velocity of 100 m/s, the average heat flux from the surfaceto the air is 20,000 W/m2. If a second object of the same shape,but with a characteristic length of 5 m, is maintained at a surfacetemperature of 450 K and is placed in atmospheric air at T? 300 K,what will the value of the average convection coefficient be if theair velocity is 20 m/s?
