Afinned wall is constructed of aluminum. the fins are circular- rod/pin. the wall is maintained at a constant temperature of 100 oc and the fins are exposed to a convection environment at 20 oc. the assembly will be cast from the aluminum material and must dissipate 50 w of heat under the conditions noted and using minimum weight of aluminum. assuming a square array, determine suitable combinations of number of fins, fin spacing and fin dimension to accomplish this cooling for film heat transfer coefficients of 8 w/m2 oc and 20 w/m2 oc. assume the wall to be 2 mm thick and a uniform value of h for both the fin and wall surface.