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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v20.i6.50
pages 549-557

VISUAL STUDY OF TURBULENT FILTRATION IN POROUS MEDIA

Aleksei R. Evseev
Kutateladze Institute of Thermophysics, 1 Lavrentiev Avenue, Novosibirsk, 630090, Russia

ABSTRACT

The effect of pore geometry and Reynolds number (1000−20000) on the flow structure, formation of vortex zones, and their scale in a stationary layer of spheres was studied visually in the turbulent developed regime of filtration using the refractive-index matching technique. Three types of packing with different porosity were realized in the experiments: a cubic packing with through channels, octahedral packing with blocked channels, and random packing. For the regular packing in the turbulent regime, the shape and size of the resulting vortex structures are determined by the packed bed geometry, and do not depend on the Reynolds number in the considered range. Vortex structures are usually formed near the contact points of spheres; their sizes do not exceed the pore scale. In the random packing of spheres in the filtration turbulent flow, the small zones of separation are formed first, where the vortex structure stabilizes quickly. The further increase in the Reynolds number leads to formation of the larger vortex regions of recirculation, which, however, do not occupy the entire shadow area behind the sphere.