An Experimental Investigation of Natural Convection Heat Transfer from Various Shapes of Perforated Fin Array at Different Inclinations

Heat transfer enhancement is the major research area in which many researchers are working to fulfil the need of equipments which are capable to provided high heat transfer density. The removal of excessive heat from system components is essential to avoid the damaging effects of burning or overheating. Therefore, the enhancement of heat transfer is an import subject of thermal engineering. The heat transfer from surfaces may in general be enhanced by increasing the heat transfer coefficient between a surface and its surroundings, by increasing the heat transfer area of the surface, or by both. In most cases, the area of heat transfer increased by utilizing extended surfaces in the form of fins attached to walls and surfaces. Extended surfaces frequently used in heat exchanging devices for the purpose of increasing the heat transfer between a primary surface and the surrounding fluid. In last few decades, energy crises have created need of usage of higher efficient heat exchanging devices. A lot of research work in this area of heat transfer has already done and still in process by various researchers. This topic of heat transfer enhancement has acquired position of special branch of heat transfer. Increasing heat transfer coefficient by changing surface geometries, so that thermal and hydrodynamic boundary layer is avoided. Now the time has come to standardize the heat transfer enhancement techniques. Increasing the roughness of heat transfer surface area will increase the heat transfer rate but also increase the pressure drop across the section which increases the pumping power. Fins are commonly applied for heat management in electrical appliances, such as computer power supplies or substation transformers and other applications include IC engine cooling, Fins in Automobile radiator. Extensions on the finned surfaces is used to increases the surface area of the fin. When the surface area increase the more fluid contact to increase the rate of heat transfers from the base surface as compare to fin without the extensions provided to it. The concept of heat transfer through perforated in fin array also one of the method to improve the heat transfer character.