Numerical study on the inertial effects of particles on the rheology of a suspension
Numerical study on the inertial effects of particles on the rheology of a suspension
复制标题
颗粒惯性对悬浮液流变学影响的数值研究
DOI：
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发表时间：
2019
影响因子：
2.1
通讯作者：
K. Morinishi
中科院分区：
文献类型：
--
作者：
T. Fukui;M. Kawaguchi;K. Morinishi
爱因斯坦的粘度公式只适用于流体动力学相互作用或惯性效应可以忽略不计的稀悬浮液。因此，应该研究流体动力学相互作用或惯性对悬浮液流变学的影响。为了评估微观颗粒的惯性效应对悬浮液的宏观流变性，压力驱动流模拟与各种限制和雷诺数进行了双向耦合方案。结果表明，即使在悬浮液浓度相同的情况下，悬浮液的相对粘度也随粒径的增大而减小。结果还表明，在应用爱因斯坦粘度公式时，限制应小于0.02。此外，在高雷诺数条件下的悬浮液的相对粘度增加，因为向外的颗粒迁移，和悬浮液的非牛顿性质从触变性到澄清性的变化。悬浮液是一种潜在的流体，因为悬浮颗粒的行为，即其微观结构，改变了其宏观流变特性。可以说，惯性是控制悬浮液流变性的有希望的因素之一。
Einstein’s viscosity formula is only applicable for dilute suspensions in which hydrodynamic interactions or inertial effects are sufficiently negligible. Therefore, the contribution of hydrodynamic interactions or the effects of inertia on the rheology of suspensions should be investigated. In order to evaluate the inertial effects of microscopic particles on the macroscopic rheology of a suspension, pressure-driven flow simulations with various confinements and Reynolds numbers were performed by a two-way coupling scheme. The results showed that the relative viscosity of the suspension decreases with increase in the particle size even when the concentration of the suspension remains the same. The results also indicated that the confinement should be less than 0.02 when applying Einstein’s viscosity formula. Moreover, the relative viscosity of the suspension under a high Reynolds number condition increases because of outward particle migration, and the non-Newtonian property of the suspension changes from thixotropy to dilatancy. Suspension is a potential fluid because its macroscopic rheological properties are altered owing to suspended particles’ behavior, that is, its microstructure. It can be stated that inertia is one of the promising factors to control suspension rheology.
影响因子：
56.9
作者：
FRANGOS, JA;ESKIN, SG;IVES, CL
通讯作者：
IVES, CL
DOI：
10.1098/rspa.2009.0445
发表时间：
2010-04-08
影响因子：
3.5
作者：
Mueller, S.;Llewellin, E. W.;Mader, H. M.
通讯作者：
Mader, H. M.