中国物理B ›› 2005, Vol. 14 ›› Issue (12): 2529-2538.doi: 10.1088/1009-1963/14/12/026

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Orientation distribution of fibres in a channel flow of fibre suspension

林建忠1, 李俊1, 张卫峰2   

  1. (1)Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University, Hangzhou 310027, China; (2)Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, New Jersey, 08903-0231
  • 收稿日期:2005-04-25 修回日期:2005-07-24 出版日期:2005-12-20 发布日期:2005-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation (Grant No 10372090) and the Doctorate Program of Higher Education of China (Grant No 20030335001).

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   

  1. 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
  • Received:2005-04-25 Revised:2005-07-24 Online:2005-12-20 Published:2005-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation (Grant No 10372090) and the Doctorate Program of Higher Education of China (Grant No 20030335001).

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摘要： 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.

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.

Key words: fibres, orientation, concentration, channel flow, numerical simulation

中图分类号:  (Channel flow)

  • 47.27.nd
47.15.Rq (Laminar flows in cavities, channels, ducts, and conduits) 47.57.E- (Suspensions) 47.27.Jv (High-Reynolds-number turbulence) 47.27.ek (Direct numerical simulations)