Particle segregation in falling polydisperse suspension droplets

Particle segregation in falling polydisperse suspension droplets
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下落的多分散悬浮液滴中的颗粒分离

DOI:
10.1017/jfm.2015.111
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发表时间:
2015
影响因子:
3.7
通讯作者:
Li, Shuiqing
Li, Shuiqing
中科院分区:
工程技术2区
文献类型:
--
作者:
Faletra, Melissa;Marshall, Jeffrey S.;Yang, Mengmeng;Li, Shuiqing

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研究了由不同密度和尺寸的颗粒混合物组成的多分散液滴在重力作用下的悬浮液滴下落问题。这项研究是使用基于oseenlet粒子相互作用的模拟和实验室实验进行的。悬浮液滴内的颗粒的流体动力学相互作用允许颗粒的多分散集合作为连贯的液滴落下,即使对于颗粒终速的差异将导致它们在不存在流体动力学相互作用的情况下彼此快速分离的情况。然而,观察到一个逐渐分离的现象,其中具有较低的终端速度的颗粒优先离开悬浮液滴进入液滴尾部,而具有较高的终端速度的颗粒在液滴内停留更长的时间。当对双分散混合物进行计算和实验时,最终达到所有较轻/较小的颗粒都喷射到液滴尾部并且液滴继续下降的点,只有较重/较大的颗粒。
The problem of a suspension droplet falling under gravity was examined for polydisperse droplets composed of a mixture of particles with different densities and sizes. The study was conducted using both simulations based on oseenlet particle interactions and laboratory experiments. The hydrodynamic interactions of the particles within the suspension droplet allow a polydisperse collection of particles to fall as a coherent droplet, even for cases where the difference in particle terminal velocity would cause them to separate quickly from each other in the absence of hydrodynamic interactions. However, a gradual segregation phenomenon is observed in which particles with lower terminal velocity preferentially leave the suspension droplet by entering into the droplet tail, whereas particles with higher terminal velocity remain for longer periods of time within the droplet. When computations and experiments are performed for bidisperse mixtures, a point is eventually reached where all of the lighter/smaller particles are ejected into the droplet tail and the droplet continues to fall with only the heavier/larger particles.
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