Drag coefficients of irregularly shaped particles
Drag coefficients of irregularly shaped particles
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DOI：
10.1016/j.powtec.2003.10.002
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发表时间：
2004-01
影响因子：
5.2
通讯作者：
S. Tran-Cong;E. Michaelides
中科院分区：
文献类型：
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作者：
S. Tran-Cong;E. Michaelides
实验研究了有序填充球体在牛顿流体中运动的孤立群的稳态自由落体条件。本文报道了六种不同几何形状的阻力系数的测量，包括等距、轴对称、正交异性、平面和伸长的球体。从这些测量，一个新的和准确的经验相关的阻力系数，CD，各种形状的颗粒已经发展。这种相关性是用基于粒子公称直径Re、表面等效球与公称直径之比dA/dn和粒子圆度c的雷诺数来表示的。这些预测已经根据本研究收集的cd2实验数据和之前报道的立方体、矩形平行六面体、四面体、圆柱体和其他形状的实验数据进行了测试。在0.15<Re<1500, 0.80<dA/dn<1.50和0.4<c<1.0的范围内，不同形状的球团和规则形状的颗粒都有很好的一致性。
The steady-state free-fall conditions of isolated groups of ordered packed spheres moving through Newtonian fluids have been studied experimentally. Measurements of the drag coefficients are reported in this paper for six different geometrical shapes, including isometric, axisymmetric, orthotropic, plane and elongated conglomerates of spheres. From these measurements, a new and accurate empirical correlation for the drag coefficient, CD, of variously shaped particles has been developed. This correlation has been formulated in terms of the Reynolds number based on the particle nominal diameter, Re, the ratio of the surface-equivalent-sphere to the nominal diameters, dA/dn, and the particle circularity, c. The predictions have been tested against both the experimental data for CDcollected in this study and the ones reported in previous works for cubes, rectangular parallelepipeds, tetrahedrons, cylinders and other shapes. A good agreement has been observed for the variously shaped agglomerates of spheres as well as for the regularly shape particles, over the ranges 0.15<Re<1500, 0.80<dA/dn<1.50 and 0.4<c<1.0.