Exploring shear-induced segregation in controlled-velocity granular flows

Exploring shear-induced segregation in controlled-velocity granular flows
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探索受控速度颗粒流中剪切引起的分离

DOI:
10.1051/epjconf/202124903012
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发表时间:
2021
影响因子:
--
通讯作者:
Umbanhowar, Paul B.
Umbanhowar, Paul B.
中科院分区:
--
文献类型:
--
作者:
Jing, Lu;Ottino, Julio M.;Lueptow, Richard M.;Umbanhowar, Paul B.

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地球物理和工业颗粒流中的颗粒分离通常由重力和剪切驱动。虽然重力引起的偏析是相对较好的理解,剪切引起的偏析是不是。特别是,在没有重力的情况下,是什么控制了分离,以及剪切和重力驱动的分离之间的相互作用仍然不清楚。在这里,我们探讨了剪切诱导的分离力的入侵粒子在受控速度颗粒流的剪切剖面系统地变化。剪切诱导的分离力被发现是成比例的剪切速率梯度,这有效地推动大入侵者从较低到较高的剪切速率区域。一个标度律的隔离力,是准确的覆盖层压力和剪切速率,因此惯性数在很宽的范围。
Particle segregation in geophysical and industrial granular flows is typically driven by gravity and shear. While gravity-induced segregation is relatively well understood, shear-induced segregation is not. In particular, what controls segregation in the absence of gravity and the interplay between shearand gravity-driven segregation remain unclear. Here, we explore the shear-induced segregation force on an intruder particle in controlled-velocity granular flows where the shear profile is systematically varied. The shear-induced segregation force is found to be proportional to the shear rate gradient, which effectively pushes the large intruder from lower to higher shear rate regions. A scaling law is developed for the segregation force that is accurate over a wide range of overburden pressures and shear rates, and hence inertial numbers.
DOI: 10.1103/physrevresearch.2.022069
发表时间: 2020-06-30
影响因子: 4.2
作者:
Jing, Lu;Ottino, Julio M.;Umbanhowar, Paul B.
通讯作者: Umbanhowar, Paul B.
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DOI: --
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期刊: Physical Review E
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