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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

TURBULENT TRANSPORT OVER ANISOTROPIC POROUS MEDIA

Get access (open in a dialog) DOI: 10.1615/IHTC16.cov.021817
pages 3223-3230

Abstract

Planar PIV measurements of flows over anisotropic porous media are carried out. Three kinds of anisotropic porous media (cases 1-3) are considered to form a bottom wall of fully developed channel flows. Their wall permeability tensor is designed to have anisotropic elements. The wall-normal component (wall-normal permeability): Kyy, is always larger than the other components by the factor of 1.3-170. Case 1 has the largest wall-normal permeability that is 88 times larger than those of cases 2 and 3. Hence, Kcase1yy >> Kcase2yy = Kcase3yy. The streamwise component (streamwise permeability): Kxx, of case 1 is 25% smaller than that of case 2 while case 3's is 25% larger than case 2's. Hence, Kcase3xx > Kcase2xx > Kcase1xx. The range of the measured Reynolds number is Reb=900-13000 to cover laminar to turbulent flows. It is found that the turbulent flow profiles depend on the streamwise permeability. Indeed, the turbulence level accords with the order of Kcase3xx > Kcase2xx > Kcase1xx. The larger Kxx produces the stronger turbulence. However, from a quadrant analysis, it is found that sweeps and ejections near the porous media are clearly influenced by both the wall-normal and streamwise permeabilities.