Drag Coefficient on Two Rigid Spheres Normnal to a Plane
Date Issued
2006
Date
2006
Author(s)
Yang, Shu-Chuan
DOI
zh-TW
Abstract
The influence of the presence of a boundary on the drag of rigid entities is investigated by considering the movement of two identical, rigid, coaxial spheres normal to a plane in both a Newtonian and a Carreau fluid. The parameters key to the phenomenon under consideration, including the nature of the fluid, the separation distance between two particles, the distance between particle and the plane, and the Reynolds number, on the drag coefficient are discussed. The results of numerical simulation reveal that the influence of a boundary on the drag coefficient is more important than that of the nature of a fluid and that of the distance between two particles. The variation of the drag coefficient as a function of Reynolds number for a Carreau fluid is similar to that for a Newtonian fluid. Due to the shear-thinning nature of the former fluid the drag coefficient in the former is smaller than that in the latter fluid. The magnitude of the drag coefficient is inversely proportional to the Carreau number. The influence of the index parameter of a Carreau fluid becomes appreciable when the Carreau number is sufficiently large.
Subjects
拖曳係數
卡羅流體
平板
兩顆球
Drag coefficient
Carreau fluid
plane
two spheres
Type
thesis
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