Orientation distribution of fibres in a channel flow of fibre suspension
Lin Jian-Zhong (林建忠)a, Li Jun (李俊)a, Zhang Wei-Feng (张卫峰)b
a Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University, Hangzhou 310027, China; b Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, New Jersey, 08903-0231
Abstract The orientation and concentration distributions of fibres in laminar and turbulent channel flows are investigated numerically. The obtained results are in good agreement with the experimental data. In the laminar flow regime, more fibres orient to the flow direction as the Reynolds number increases. The shear rate of fluid around a fibre plays an important role in determining the orientation distribution of fibres, while the fibre density and the fibre aspect-ratio have marginal influence on the orientation distribution. In the turbulent regime, the orientation distribution of fibres becomes more homogeneous with the increase of Reynolds number, and the concentration profile is flatter than that in the laminar regime. The fluctuating intensity of fibre velocity in the downstream direction is larger than that in the lateral directions.
Received: 25 April 2005
Revised: 24 July 2005
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation (Grant No 10372090) and the Doctorate Program of Higher Education of China (Grant No 20030335001).
Cite this article:
Lin Jian-Zhong (林建忠), Li Jun (李俊), Zhang Wei-Feng (张卫峰) Orientation distribution of fibres in a channel flow of fibre suspension 2005 Chinese Physics 14 2529
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