雷诺数对窄槽道内绕圆柱纤维悬浮流场的影响  

Effect of Reynolds number on the fiber orientation in a suspension flow through a slit channel containing a cylinder

作　　者：叶兴联[1] 王灿星[1] 李月仙[2] 汪一鸣[2] 

机构地区：[1]浙江大学流体工程研究所,杭州310027 [2]杭州振兴工业泵制造有限公司,杭州311234

出　　处：《水动力学研究与进展（A辑）》2010年第5期640-647,共8页Chinese Journal of Hydrodynamics

基　　金：浙江省重大科技专项(No.2008C01024-4)

摘　　要：采用有限差分法计算流场,基于细长体理论确定纤维取向,数值模拟了窄槽道内绕圆柱的纤维悬浮流场。将数值模拟部分结果与实验结果对比,两者吻合较好。数值模拟结果表明,对于圆柱上游的区域而言,雷诺数的变化对纤维的取向分布影响不大。而对圆柱下游的区域而言,雷诺数的变化导致了圆柱尾部流场特性的变化,从而使得纤维的取向分布发生较大的变化,所以雷诺数对纤维取向分布有较大影响。论文的结论对于纤维复合材料成型的工程应用具有指导意义。Fiber orientations were simulated numerically in a suspension flow through a slit channel containing a cylinder. The finite difference method was used to calculate the flow velocity, and the slender-body theory was employed to predict the fiber orientation distribution. Some computational results were compared with the experimental data, and the good agreement was achieved. The results show that the variation of Reynolds number has a little effect on the fiber orientation distribution for the areas upstream of the cylinder. However, the variation of Reynolds number, for the areas downstream of the cylinder, results in the variety of flow behind the cylinder as well as the greater variation of fiber orientation distribution. Therefore, the Reynolds number has a significant effect on the fiber orientation distribution. The conclusion is helpful for the practical usage of the forming of fiber composites.

关 键 词：纤维悬浮流 取向 含圆柱窄槽道 数值模拟 

分 类 号：O359[理学—流体力学]