Atotal of 10 rectangular aluminum fins (k 5203 w/m·k) are placed on the outside flat surface of anelectronic device. each fin is 100 mm wide, 20 mm highand 4 mm thick. the fins are located parallel to each otherat a center-to-center distance of 8 mm. the temperature atthe outside surface of the electronic device is 60°c. the airis at 20°c, and the heat transfer coefficient is 100 w/m2.k. determine(a) the rate of heat loss from the electronic device to the surrounding air and (b) the fin effectiveness.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux