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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/88196

    Title: Hydrodynamic Drag on Non-Spherical Floc and Free-Settling Test
    Authors: Wu, R. M.;Lee, D. J.
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: drag;spheroid;porous;numerical;free-settling experiment
    Date: 2001-09-01
    Issue Date: 2013-04-13 17:38:32 (UTC+8)
    Publisher: I W A Publishing
    Abstract: This work numerically investigates the hydrodynamic drag force exerted on a porous spheroid floc moving steadily through a quiescent Newtonian fluid over a wide range of the Reynolds number. The flow patterns for a highly porous spheroid moving at an elevated Reynolds number are basically the same as those at a low Reynolds number, which extends the applicable range of a creeping-flow based correlation to the higher Reynolds number regime. The shape effect becomes more prominent as the spheroid becomes more porous. Using the equivalent diameter, defined as the geometric mean diameter of the principal axes, leads to a universal correlation relating to the drag force, aspect ratio, and interior permeability. In addition, free-settling experiments are performed to estimate how the non-spherical shape affects the three sludge samples. The possible errors in data reduction for the free-settling test are attributed to the a/b ratio and the internal permeability. The errors range from 16-34% for a/b = 0.6-2.0.
    Relation: Water research 35(13), pp.3226-3234
    DOI: 10.1016/S0043-1354(01)00050-1
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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