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Effect of two bounding walls on the rotational motion of a fiber in the simple shear flow

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Abstract

The effect of two bounding walls on the rotational motion of a freely suspended non-Brownian fiber in the simple shear flow at low Reynolds number was investigated numerically using the lattice-Boltzmann method. Data were reported for the fibers with aspect ratios of 8, 10, and 15 under various ratios of wall gap (2h) to fiber length (L). For 2h/L≥3.0, the time-dependent orientation of the fiber is shown to be in quantitative agreement with the Jeffery’s theory for ellipsoids suspended in an unbounded linear shear flow, and the effect of the walls on the rotational period of the fiber is insignificant for all fibers with different aspect ratios. For 1.8≤2h/L<3.0, the results reveal that the walls have different effects on the rotation of fiber. For 2h/L<1.8, the complete periodical motion of the fiber is suppressed. The fiber rotates to nearly aligning with the flow direction, and then ceases to rotate. In this orientation, the walls have a stabilizing effect on the fiber and this effect is more pronounced for the fibers with large aspect ratio. The fiber finally does not orient with the flow direction, but with a small angle with the flow direction, and the angle is an increasing function of the fiber aspect ratio and dependent on the wall gap.

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Authors and Affiliations

  1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Xiaoke Ku & Jianzhong Lin

  2. China Jiliang University, Hangzhou, 310018, China

    Jianzhong Lin

Authors
  1. Xiaoke Ku
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  2. Jianzhong Lin
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Correspondence to Jianzhong Lin.

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Ku, X., Lin, J. Effect of two bounding walls on the rotational motion of a fiber in the simple shear flow. Fibers Polym 10, 302–309 (2009). https://doi.org/10.1007/s12221-009-0302-7

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  • DOI: https://doi.org/10.1007/s12221-009-0302-7

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