【摘要】 本文从纳维-斯托克司方程出发,用有限差分法计算粘性流体绕三维均匀正方排列无穷球点阵的流动,以图估计两相流动中颗粒体积率和颗粒雷诺数对颗粒阻力的影响。计算中使用了贴体坐标数值网格生成方法。计算结果和实验结果、经验公式作了比较。考虑到真实两相流动的复杂性及本文采用的力学模型的理想性,可以认为两者吻合较好。更多还原

【Abstract】 Among coupling forces between particles and the carrier fluid in two phase flows, the classical drag force is usually predominant, therefore, most broadly studied. In this article, with motivation of evaluating effects of the particle volume fraction on the drag force exerted on particles in two phase flows, a viscous flow past a three-dimensionally infinite cubic array of spheres with the finite Reynolds numbers is numerically investigated. Body fitted grid generation method is employed for the computation. The numerical results are compared with empirical formula.Considering the complexity involved in real two phase flows and ideality of the mechanical model employed in this numerical investigation, the agreement is thought reasonably good,更多还原