Drag on two nonuniformly structured flocs moving along the axis of a cylindrical tube
學年 95
學期 2
出版（發表）日期 2007-06-01
作品名稱 Drag on two nonuniformly structured flocs moving along the axis of a cylindrical tube
作品名稱（其他語言）
著者 Hsu, Jyh-ping; Yeh, Shu-jen; 曾琇瑱; Tseng, Shio-jenn
單位 淡江大學數學學系
出版者 Springer
著錄名稱、卷期、頁數 Colloid Polymer Science 285(9), pp.985-998
摘要 The boundary effect on the drag on two identical, nonuniformly structured flocs moving along the axis of a cylindrical tube filled with a Newtonian fluid is investigated at a small to medium larger Reynolds number. A two-layer model is adopted to simulate various possible structures of a floc, and the flow field inside is described by Darcy–Brinkman model. The results of numerical simulation reveal that a convective flow is present in the rear region of a floc when Reynolds number is on the order of 40. The presence of the tube wall and/or the porous structure of a floc has the effect of reducing that convective flow. For a fixed level of the volume-average permeability of a floc, the influence of the tube wall on the drag depends upon floc structure; the influence on a nonuniformly structured floc is more significant than that on a uniformly structured floc. The more nonuniform the floc structure, the more appreciable the deviation of the drag coefficient–Reynolds number curve from a Stokes’-law-like relation becomes. The smaller the volume-average permeability of a floc and/or the smaller the separation distance between the two flocs, the greater is the deviation, but the presence of the tube wall has the effect of reducing that deviation.
關鍵字 Drag on two flocs;Nonuniformly structured;Boundary effect;Flocs in cylindrical tube
語言 en
ISSN 0303-402X
期刊性質 國內
收錄於
產學合作
通訊作者
審稿制度 否
國別 TWN
公開徵稿
出版型式 ,電子版
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