Due to blockage of fluid flow, the convection heat transfer coefficient for the finned and prime surfaces of a fin array in general decreases as the number of fins increases. Consider the fin array shown below, with wall height of 20 mm, w = 20 mm, t= 2 mm, and L = 20 mm. The fins are aluminum and the base and environment temperatures are Tb = 95C and T = 20C. As a first approximation, assume h = hmax x (1 - N/Nmax) where Nmax is the maximum number of fins that can be placed on a surface, so that Nmax = 20 mm/2 mm = 10. For hmax = 50 W/m? K, determine the total heat rate for N = 0, 3, 6, and 9 fins. T, h