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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Influence on Stress Jump Coefficient of Porous Structure and Flow Conditions

Get access (open in a dialog) DOI: 10.1615/IHTC15.pmd.009590
pages 6681-6691

Résumé

The flow in a cavity partially filled with a porous layer was concerned and the stress jump coefficient at the porous/fluid interface was analyzed in detail. The influences of three key factor on stress jump coefficient- physical properties of fluid, Rayleigh number and porous structure were the focus in the work. Two pictures of real porous structure, sponge and brick, ob tained by using X-ray computed tomography technique were imported into the physical model respectively. One-domain approach was used to simulate the fluid flow and heat transfer in the whole cavity. FEM was used to solve the governing equations. For different fluid filled in a cavity respectively, the value of stress jump coefficient for air would be larger than that for water and oil. The stress jump coefficient would decrease slightly with increasing Rayleigh number for water and oil, but it would keep constant nearly for air. When different porous medium was filled partially in the cavity, the stress jump coefficient was larger for the brick than the sponge. Similar results was found in the constructed porous medium. The stress jump coefficient would diminish with increasing permeability for water and oil, and conversely for air. An equivalent stress jump coefficient was defined to compare the cases for the cavity partially filled with constructed porous medium or real porous medium, and the value was larger for sponge or brick compared with constructed porous medium.