A numerical study of convection in a channel with porous baffles

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Title: A numerical study of convection in a channel with porous baffles
Author: Miranda, Bruno Monte Da Silva
Abstract: The effects on heat transfer in a two -dimensional parallel plate channel with sixteen porous baffles in a staggered arrangement with a uniform heat flux heating applied to the top and bottom walls has been numerically investigated . Developing Flow (DF ) was considered for this study . The Brinkman -Forchheimer -extended Darcy model was used for modeling the heat transfer and fluid flow through the porous baffles . The flow was assumed to be laminar . A finite volume based method in conjunction with the SIMPLEC algorithm was used to solve the model equations . Calculations were made by varying several independent parameters such as Reynolds number (Re ) , Darcy number & #9118 ; (Da ) , thermal conductivity ratio & #9115 ; & #9116 ; k e kf & #9120 ; & #9119 ; , baffle thickness ( * ) , non -dimensional w & #9117 ; baffle spacing ( * ) , and non -dimensional baffle height ( * ) . w The results of the study established that porous baffles out perform solid baffles from a pressure drop point of view . However , porous baffles under perform solid baffles from a heat transfer point of view . The ratio representing increase in heat transfer per unit increase in pumping power (heat transfer performance ratio ) was found to be less than unity for all cases . Increasing the Darcy number was found to produce less desirable heat transfer enhancement ratios . Increasing the non -dimensional baffle spacing (d /w ) and the baffle aspect ratio (H /w ) were found to enhance heat transfer .
URI: http : / /hdl .handle .net /1969 .1 /1612
Date: 2005-02-17

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A numerical study of convection in a channel with porous baffles. Available electronically from http : / /hdl .handle .net /1969 .1 /1612 .

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