Inertial migration of spherical particles in channel flow of power law fluids
Inertial migration of spherical particles in channel flow of power law fluids
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DOI：
10.1063/5.0013725
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发表时间：
2020-08-01
影响因子：
4.6
通讯作者：
Alexeev, Alexander
中科院分区：
文献类型：
--
作者：
Chrit, Fatima Ezahra;Bowie, Samuel;Alexeev, Alexander
采用三维数值模拟方法研究了幂律流体中中性浮力颗粒在压力驱动的平行壁面间流动中的横流惯性迁移。颗粒被建模为刚性和顺应性的球壳填充有牛顿流体。我们的模拟表明，在流中的颗粒平衡在稳定的偏心位置，这取决于颗粒的大小和流体的幂指数。在剪切增稠流体中，平衡位置对颗粒尺寸不敏感。在剪切稀化流体中，对于较小的颗粒出现额外的不稳定的偏心平衡位置，这导致这些颗粒在通道中心线处的积聚。我们发现，这些平衡位置是不敏感的通道雷诺数和颗粒弹性的大小。我们的研究结果可应用于合成颗粒和生物细胞的分选、聚焦和分离。
The cross-stream inertial migration of neutrally buoyant particles in a power law fluid in a pressure-driven flow between two parallel walls is studied using three-dimensional numerical simulations. The particles are modeled as rigid and compliant spherical shells filled with a Newtonian fluid. Our simulations show that the particles in the flow equilibrate at stable off-center positions that depend on the particle size and fluid power exponent. In a shear thickening fluid, the equilibrium position is insensitive to the particle size. In a shear thinning fluid, an additional unstable off-center equilibrium position emerges for smaller particles, which leads to the accumulation of such particles at the channel centerline. We find that these equilibrium positions are insensitive to the magnitude of the channel Reynolds number and particle elasticity. The results of our study have applications to sorting, focusing, and separation of synthetic particles and biological cells.