Abstract
Fins are the extended surfaces through which heat transfer takes place by conduction and convection to keep the base surface cool. Fins of various configurations are presently used ranging from automobile engines to cooling of chip in a computer. Fins used presently are solid with different shapes but in the present research such solid fins are compared with solid fins having maximum of 10 numbers of embossing’s that further increases the surface area for maximum heat transfer. Importance in this research is given to variation of temperature along the length of the fins which in turn gives rate of heat transfer. Thus this research is under taken to increase the efficiency of fins (by extracting heat from the base surface) which is highly demanded today for air cooled engines, compressors, refrigerators etc. In the present research, SOLID70 element and SURF152 elements are used for FE analysis. Methodology involves 3D rectangular fin modelling and meshing, creation of surf elements for the modeling, applying the boundary conditions and source temperature, applying the material property (aluminum) to obtain the steady state thermal contours. FEA results are finally compared with analytic and experimental values for validity. In the present research, a solid rectangular aluminum fin and the same rectangular fin with 2, 4, 8 and 10 embossing’s were compared through finite element analysis for its temperature distribution along the length. FEA analysis of the present research showed that fins having embossing’s were more efficient compared to that a simple solid fin. Hence it is concluded from the present research that embossing’s at preferred locations further increases the rate of heat transfer. From the present analysis it is concluded that the mathematical and FEA for a solid rectangular fin without embossing’s are converging within ±1.2°C and rectangular fin with 10 embossing’s is converging within ±1.4°C and hence the validity.
Highlights
IntroductionThe basic law that governs the convective heat transfer is Newton’s law of cooling given by:
The basic law that governs the convective heat transfer is Newton’s law of cooling given by:( ) =Q h A Ts − Tf, Watts (1)where: Ts: the surface temperatureC; Tf: the fluid temperatureC; h: the convective heat transfer coefficient w/m2 ̊C; A: surface area, m2.Note that in the above equation, film coefficient of heat transfer or the convective heat transfer coefficient “h” is very important which mainly depends on the type of the surface, size, shape, its temperature, surface finish etc
Fins used presently are solid with different shapes but in the present research such solid fins are compared with solid fins having maximum of 10 numbers of embossing’s that further increases the surface area for maximum heat transfer
Summary
The basic law that governs the convective heat transfer is Newton’s law of cooling given by:. The zone of warmth exchange is expanded by developing surfaces. These amplified surfaces are called as fins. Because of popularity for light weight, smaller and sparing fins, the enhancement of balance size is of awesome significance [4] Along these lines, fins must be intended to accomplish most extreme warmth expulsion with least material use considering the simplicity of the balance fabricating. Extending the temperature incline between the article and the earth, growing the convection heat trade coefficient, or extending the surface zone of the thing constructs the glow trade. It is not achievable or down to earth to change the underlying two choices In this way, adding a cutting edge to a thing assembles the surface zone and can rarely be a calm response for warmth trade issues [8]. It is well known that major heat transfer from the fin is by convection and performance of a fin is evaluated by its efficiency and effectiveness
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