Circular aluminum fins of constant rectangular profile are attached to a tube of outside diameter d = 5 cm. the fins have thickness t = 2 mm, height l = 15 mm, thermal conductivity k = 200 w/(m • °c), and spacing 8 mm (that is, 125 fins per 1-m tube length). the tube surface is maintained at a uniform temperature t0 = 200°c, and the fins dissipate heat by convection into the ambient air at to, = 30°c with a heat transfer coefficient h^ = 50w/(m2oc). determine the net heat transfer per 1-m length of tube.