Computational Analysis of Natural Convection Heat Transfer from Vertical Plates with Extended Surfaces
Abstract
Theoretical studies and analysis of heat transfer from a plain plate and square pin finned plate have been carried out in this study to find out Nusselt number for various fin geometry and orientation of fins. The objective of the present study is to study heat transfer characteristics on the vertical plate with fins both for conductive and non-conductive fins. In this study the effect of fin spacing, aspect ratio, fin height, fin thickness and fin orientation on average Nusselt number have been investigated. A finite volume numerical method is used to envisage the flow field and temperature field close to the plate with both staggered and inline arrangements of fins. The maximum increase of average Nusselt number is found to be around 35% for pin finned plate in comparison to the plate with no fins under same operating conditions. The maximum value is achieved with optimal fin spacing of and , , and 45o inclination of fins. The average Nusselt number is found to decrease with increase in orientation angle of fins. It increases with increase in fin aspect ratio. Present study reveals that in-line and staggered arrangements do not yield appreciably different results. The maximum average Nusselt number difference between conductive and non-conductive fins is around 5 % for Sh/W = 0.33, Sv/L = 0.2 at = 450, fin height of 6 mm (H/t = 2).
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