Capillary Interactions, Aggregate Formation, and the Rheology of Particle-Laden Flows: A Lattice Boltzmann Study,Industrial & Engineering Chemistry Research

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Capillary Interactions, Aggregate Formation, and the Rheology of Particle-Laden Flows: A Lattice Boltzmann Study
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-20 , DOI: 10.1021/acs.iecr.1c03909
Lei Yang ₁ , Marcello Sega ₁ , Steffen Leimbach ₂ , Sebastian Kolb ₂ , Jürgen Karl ₂ , Jens Harting _{1,

3}

Affiliation

The agglomeration of particles caused by the formation of capillary bridges has a decisive impact on the transport properties of a variety of at a first sight very different systems such as capillary suspensions, fluidized beds in chemical reactors, or even sand castles. Here, we study the connection between the microstructure of the agglomerates and the rheology of fluidized suspensions using a coupled lattice Boltzmann and discrete element method approach. We address the influence of the shear rate, the secondary fluid surface tension, and the suspending liquid viscosity. The presence of capillary interactions promotes the formation of either filaments or globular clusters, leading to an increased suspension viscosity. Unexpectedly, filaments have the opposite effect on the viscosity as compared to globular clusters, decreasing the suspension viscosity at larger capillary interaction strengths. In addition, we show that the suspending fluid viscosity also has a nontrivial influence on the effective viscosity of the suspension, a fact usually not taken into account by empirical models.

中文翻译：

毛细管相互作用、聚集体的形成和粒子流的流变学：格子玻尔兹曼研究

由毛细管桥的形成引起的颗粒团聚对各种乍一看非常不同的系统的传输特性具有决定性的影响，例如毛细管悬浮液、化学反应器中的流化床，甚至沙堡。在这里，我们使用耦合格子玻尔兹曼和离散元方法方法研究团聚体的微观结构与流化悬浮液的流变学之间的联系。我们解决了剪切速率、二次流体表面张力和悬浮液粘度的影响。毛细管相互作用的存在促进了细丝或球状簇的形成，导致悬浮液粘度增加。出乎意料的是，与球状簇相比，细丝对粘度的影响相反，在较大的毛细管相互作用强度下降低悬浮液粘度。此外，我们表明悬浮液粘度对悬浮液的有效粘度也有重要影响，经验模型通常不考虑这一事实。

更新日期：2022-02-02

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