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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/44153

    Title: 3D simulations of hydrodynamic drag forces on two porous spheres moving along their centerline
    Authors: Wu, R. M.;Lin, M. H.;Lin, H. Y.;Hsu, R. Y.
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Porous;Drag force;Centerline;Simulation;3D
    Date: 2006-09-01
    Issue Date: 2010-03-09 09:58:24 (UTC+8)
    Publisher: Maryland Heights: Academic Press
    Abstract: This paper numerically evaluates the hydrodynamic drag force exerted on two highly porous spheres moving steadily along their centerline through a quiescent Newtonian fluid over a Reynolds number ranging from 0.1 to 40. At creeping-flow limit, the drag forces exerted on both spheres were approximately identical. At higher Reynolds numbers the drag force on the leading sphere (sphere #1) was higher than the following sphere (sphere #2), revealing the shading effects produced by sphere #1 on sphere #2. At dimensionless diameter β<2 (β=df/2k0.5, df and k are sphere diameter and interior permeability, respectively), the spheres can be regarded as “no-spheres” limit. At increasing β for both spheres, the drag force on sphere #2 was increased because of the more difficult advective flow through its interior, and at the same time the drag was reduced owing to the stronger wake flow produced by the denser sphere #1. The competition between these two effects leads to complicated dependence of drag force on sphere #2 on β value. These effects were minimal when β became low.
    Relation: Journal of Colloid and Interface Science 301(1), pp.227-235
    DOI: 10.1016/j.jcis.2006.04.049
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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