Particle clusters settling under gravity in a viscous fluid
Particle clusters settling under gravity in a viscous fluid
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粘性流体中的颗粒团在重力作用下沉降
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Kowalewski
中科院分区：
文献类型：
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作者：
S. Alabrudzinski;M. Ekiel;Daniel Chehata;T. Kowalewski
由少量随机配置的紧密固体球形颗粒组成的簇，在小雷诺数的粘性流体中沉积，在短时间内进行了实验研究。测量了团簇沉降速度，并显示其与先前针对球形体积内点颗粒的均匀分布导出的整体平均公式很好地近似。强调该体积的“有效半径”一般应小于由球体组成的簇的实际半径，并确定了两个半径之间的关系。该公式还被证明可以很好地解释在其他地方测量和计算的刚性砾岩的重力沉降。
Clusters made of a small number of close solid spherical particles at a random configuration, sedimenting through a viscous fluid at small Reynolds number, were experimentally investigated at a short-time scale. The cluster settling velocities were measured and shown to be well approximated by the ensemble-averaged formula derived earlier for the uniform distribution of the point particles inside a spherical volume. It was emphasized that the “effective radius” of this volume in general should be smaller than the actual radius of a cluster made of the spheres, and the relation between both radii was determined. The formula was also shown to account well for the gravitational settling of rigid conglomerates, measured and computed elsewhere.