Break-up of suspension drops settling under gravity in a viscous fluid close to a vertical wall
Break-up of suspension drops settling under gravity in a viscous fluid close to a vertical wall
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靠近垂直壁的粘性流体中在重力作用下沉降的悬浮液液滴的破碎
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Ekiel
中科院分区：
文献类型：
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作者：
Anna Myłyk;W. Meile;G. Brenn;M. Ekiel
在Stokes流型下，采用点力模型，对靠近垂直壁面的粘性流体在重力作用下的悬浮滴沉降演化进行了实验和数值研究。液滴内外的液体是一样的。悬浮固体重颗粒在球形体积内的初始分布是均匀的。在实验和模拟中，悬浮液滴的定性演变与无界流体相同。然而，从实验和数值上观察到，平均而言，液滴离壁面的距离越近，液滴的失稳时间T和液滴到破裂的距离L越小，T和L与D/h近似线性相关。不同粒子随机构型的单个液滴的失稳时间和长度彼此之间存在显著差异，这是由于混沌的存在。
The evolution of suspension drops sedimenting under gravity in a viscous fluid close to a vertical wall was studied experimentally and numerically with the use of the point-force model, in the Stokes flow regime. The fluid inside and outside the drop was identical. The initial distribution of the suspended solid heavy particles was uniform inside a spherical volume. In the experiments and in the simulations, the suspension drops evolved qualitatively in the same way as in an unbounded fluid. However, it was observed, both experimentally and numerically, that, on the average, the destabilization time T and the distance L traveled by the drop until break-up were smaller for a closer distance h of the drop center from the wall, with approximately linear dependence of T and L on D/h, for h larger or comparable to the drop diameter D. Destabilization times and lengths of individual drops with different random configurations of the particles were shown to differ significantly from each other, owing to the chaot...