Numerical investigation of pressure drop reduction without surrendering heat transfer enhancement in partially porous channel |
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| Authors: | A Zehforoosh S Hossainpour |
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| Affiliation: | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2. Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing 102206, China;3. School of Mathematics and Physics, North China Electric Power University, Beijing 102206, China;1. Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran;2. Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;3. Faculty of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan, Iran |
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| Abstract: | The present study is to investigate the numerical simulation of steady laminar forced convection in a partially porous channel, with four dissimilar porous-blocks, attached to the strip heat sources at the bottom wall. The analysis is based on the Navier–Stokes equation in the fluid field, the Darcy–Brinkman–Forchheimer flow model in the porous field, and the energy equations for two thermal fields. The effects of variations of different parameters such as porous blocks Darcy numbers, arrangements of dissimilar blocks, Forchheimer coefficient, Reynolds number, thermal conductivity and Prandtl number are investigated and the velocity and temperature fields are presented and discussed. In the dissimilar partially porous channel, it is found that when the blocks sorted from the lowest to the highest Da in the flow direction, the total heat transfer enhancement is almost the same as in the similar porous channel (Nu/Nusim = 92%), while the total pressure drop is considerably lower (P/Psim = 28%). In addition, reverse arrangement of porous blocks is suggested to prepare more uniform temperature gradient in all heat sources. |
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