Inertial migration of a deformable particle in pipe flow
Inertial migration of a deformable particle in pipe flow
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DOI：
10.1103/physrevfluids.4.104201
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发表时间：
2019-10-10
影响因子：
2.7
通讯作者：
Brandt, Luca
中科院分区：
文献类型：
--
作者：
Alghalibi, Dhiya;Rosti, Marco E.;Brandt, Luca
我们进行完全欧拉数值模拟的初始球形超弹性粒子悬浮在牛顿压力驱动流在圆柱形直管。我们研究了不同雷诺数和不同水平的颗粒弹性的完整的颗粒迁移和变形，解开惯性和弹性的相互作用的颗粒聚焦。我们观察到，颗粒变形，并经历了横向位移，而通过管道向下游行进，最后集中在管道中心线。我们注意到，迁移动力学和最终平衡位置几乎与雷诺数无关，而它们强烈依赖于颗粒弹性;特别是，随着弹性的增加，迁移更快（即，颗粒更容易变形），颗粒在更短的时间内到达中心线处的最终平衡位置。我们的模拟表明，结果不受粒子的初始条件，位置和速度。最后，我们通过计算作用在颗粒及其不同组分（粘性和弹性）上的总作用力来解释颗粒迁移。
We perform fully Eulerian numerical simulations of an initially spherical hyperelastic particle suspended in a Newtonian pressure-driven flow in a cylindrical straight pipe. We study the full particle migration and deformation for different Reynolds numbers and for various levels of particle elasticity, to disentangle the interplay of inertia and elasticity on the particle focusing. We observe that the particle deforms and undergoes a lateral displacement while traveling downstream through the pipe, finally focusing at the pipe centerline. We note that the migration dynamics and the final equilibrium position are almost independent of the Reynolds number, while they strongly depend on the particle elasticity; in particular, the migration is faster as the elasticity increases (i.e., the particle is more deformable), with the particle reaching the final equilibrium position at the centerline in shorter times. Our simulations show that the results are not affected by the particle initial conditions, position, and velocity. Finally, we explain the particle migration by computing the total force acting on the particle and its different components, viscous and elastic.