Hydrodynamic Drag on Non-Spherical Floc and Free-Settling Test
學年 90
學期 1
出版（發表）日期 2001-09-01
作品名稱 Hydrodynamic Drag on Non-Spherical Floc and Free-Settling Test
作品名稱（其他語言）
著者 Wu, R. M.; Lee, D. J.
單位 淡江大學化學工程與材料工程學系
出版者 I W A Publishing
著錄名稱、卷期、頁數 Water research 35(13), pp.3226-3234
摘要 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.
關鍵字 drag;spheroid;porous; numerical;free-settling experiment
語言 en
ISSN 0043-1354
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者
審稿制度 否
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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