13.7 Consider the right-circular cylinder of diameter D,length L, and the areas A,, A2, and A, representing the base, inner, and top surfaces, respectively. (a) Show that the view factor

between the base of the cylinder and the inner surface has the form F, = 2H[(1+ H*)/2 – H], where H = L/D. (b) Show that the view factor for the inner surface to itself has the form F = 1+ H - (1 + H²)/².22