04-02-2013, 12:50 PM
Extended Surfaces/Fins
Extended Surfaces.ppt (Size: 164 KB / Downloads: 129)
INTRODUCTION
Convection: Heat transfer between a solid surface and a moving fluid is governed by the Newton’s cooling law: q = hA(Ts-T). Therefore, to increase the convective heat transfer, one can
Increase the temperature difference (Ts-T) between the surface and the fluid.
Increase the convection coefficient h. This can be accomplished by increasing the fluid flow over the surface since h is a function of the flow velocity and the higher the velocity, the higher the h. Example: a cooling fan.
Increase the contact surface area A. Example: a heat sink with fins.