On the use of sinusoidal vibrations for disaggregating clusters of non-settling inertial particles immersed in yield-stress fluids

IF 2.7 2区工程技术 Q2 MECHANICS

Journal of Non-Newtonian Fluid Mechanics Pub Date : 2024-05-17 DOI:10.1016/j.jnnfm.2024.105261

N.P. Khabazi , T. Rezaee , M. Pourjafar-Chelikdani , S.M. Taghavi , K. Sadeghy

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引用次数: 0

Abstract

The effect of sinusoidal vibration is numerically investigated on the dynamical behavior of a cluster of 50 identical non-Brownian circular solid particles randomly distributed in a circular envelope. The cluster is immersed in a finite vessel filled with an inelastic viscoplastic fluid obeying the Casson model. The solid particles are modeled using the improved smoothed-profile method (iSPM) whereas the flow of the continuous phase is modeled using the lattice Boltzmann method (LBM). An in-house LBM-iSPM code, modified for Casson fluid, is used to study the effect of sinusoidal vibration on disaggregating the cluster. We have deliberately ignored the gravitational term in the equations of motion so that the sole effect of vibration on the cluster response can better be investigated. Numerical results suggest that vibration can disaggregate the cluster with its efficiency depending on the fluid's yield stress. For any given yield stress, vibration can disperse the cluster provided the frequency and/or amplitude of the forced oscillation are larger than a threshold. The secondary flow formed in the channel during the transient phase is shown to be the main cause of the cluster's fluid-mediated dispersion. It is shown that the system reaches equilibrium when the secondary flow is vanished through dissipation. Vibration is predicted to become more effective in disaggregating clusters the larger the size of the particles or the smaller their number density.

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利用正弦振动分解浸入屈服应力流体中的非沉降惯性微粒团块

我们用数值方法研究了正弦振动对随机分布在圆形包络中的 50 个相同的非布朗圆形固体颗粒团的动力学行为的影响。粒子群浸没在一个有限容器中，容器中充满了无弹性的粘性流体，该流体服从卡松模型。固体颗粒采用改进的平滑轮廓法（iSPM）建模，而连续相的流动则采用晶格玻尔兹曼法（LBM）建模。我们使用针对卡松流体修改的内部 LBM-iSPM 代码来研究正弦振动对团块分解的影响。我们特意忽略了运动方程中的重力项，以便更好地研究振动对星团响应的唯一影响。数值结果表明，振动可以分解簇，其效率取决于流体的屈服应力。对于任何给定的屈服应力，只要强迫振荡的频率和/或振幅大于临界值，振动就能分散集束。在瞬态阶段，通道中形成的二次流被证明是集束流体介导分散的主要原因。研究表明，当二次流通过耗散消失时，系统达到平衡。据预测，颗粒尺寸越大或数量密度越小，振动对团块的分解作用就越有效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Non-Newtonian Fluid Mechanics 物理-力学

CiteScore

5.00

自引率

19.40%

发文量

109

审稿时长

61 days

期刊介绍： The Journal of Non-Newtonian Fluid Mechanics publishes research on flowing soft matter systems. Submissions in all areas of flowing complex fluids are welcomed, including polymer melts and solutions, suspensions, colloids, surfactant solutions, biological fluids, gels, liquid crystals and granular materials. Flow problems relevant to microfluidics, lab-on-a-chip, nanofluidics, biological flows, geophysical flows, industrial processes and other applications are of interest. Subjects considered suitable for the journal include the following (not necessarily in order of importance): Theoretical, computational and experimental studies of naturally or technologically relevant flow problems where the non-Newtonian nature of the fluid is important in determining the character of the flow. We seek in particular studies that lend mechanistic insight into flow behavior in complex fluids or highlight flow phenomena unique to complex fluids. Examples include Instabilities, unsteady and turbulent or chaotic flow characteristics in non-Newtonian fluids, Multiphase flows involving complex fluids, Problems involving transport phenomena such as heat and mass transfer and mixing, to the extent that the non-Newtonian flow behavior is central to the transport phenomena, Novel flow situations that suggest the need for further theoretical study, Practical situations of flow that are in need of systematic theoretical and experimental research. Such issues and developments commonly arise, for example, in the polymer processing, petroleum, pharmaceutical, biomedical and consumer product industries.