Finned surfaces heal transfer from

Finned surfaces are commonly used in practice to enhance heat transfer. Fins enhance heal transfer from a surface by exposing a larger surface area to convection. The temperature distribution along the fin for very long fins and for fins with negligible heat transfer at the fin tip arc given by... 

The car radiator shown in Fig. 3-33 is an example of a finned. surface. The closely packed thin metal sheets attached to the hot-water tubes increase the surface area for convection and thus the rate of convection heal transfer from the lubes to the air many times. There arc a variety of innovative fin designs available in the market, and they seem to be limited only by imagination (Fig, 3 34). 

Heat mansfec cate liom the fin of base area Aj, Heal transfer rale from the surface of area A ... 

A total of 10 rectangular aluminum fins k = 203 W/ni K) arc placed on the outside flat surface of an electronic device. Each fin is 100 mm wide, 20 mm high and 4 mm thick. The fins are located parallel to each other at a cenier-to-cenler distance of 8 mm. The temperature at the outside surface of the electronic device is 60°C. The air is at 20°C, and the heal transfer coefficient is 100 W/in K. Determine (a) the rate of heat loss from Uie electronic device to the surrounding air and (b) the fin effectiveness. 

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