Shear thickening and hysteresis in dense suspensions: The effect of particle shape

IF 3 2区工程技术 Q2 MECHANICS

Journal of Rheology Pub Date : 2024-04-24 DOI:10.1122/8.0000799

M. Mahmoudian, F. Goharpey, M. Behzadnasab, Z. Daneshfar

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引用次数: 0

Abstract

The flow of dense suspension of non-Brownian particles has been considered by various studies affected by their significance in a variety of industries and natural phenomena. In this study, we investigate the effect of polyhedron morphology on shear thickening, shear jamming, and hysteresis characteristics of non-Brownian suspension of acrylate particles. Particles with the same chemical nature and three different shapes of spherical (aspect ratio Γ = 1), elliptical paraboloid (Γ ≈ 1), and boat-shaped (Γ ≈ 3) are fabricated via photopolymerization-based methods. Studied suspensions show the shear-thinning behavior at low shear stresses and shear thickening behavior at the higher range of shear stress. Also, the strength of observed shear thickening is enhanced for the suspensions of polyhedron particles, which can be attributed to the heightened degree of interparticle frictional contacts. Furthermore, it is found that angularity not only shifts the predicted frictionless and frictional jamming packing fractions to lower values but also expands the shear jamming packing fraction range. Finally, a history-dependent hysteresis is observed in all samples due to the different particle spatial structures forming in ascending and descending flow modes. The observed hysteresis loops strongly depend on the volume fraction and diminish near the jamming packing fraction due to the restricted mobility space of particles. In addition, the tumbling of elongated particles also can decrease the hysteresis loop by enhancing viscosity in the ascending flow mode, where the structures are not fully developed.

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致密悬浮液中的剪切增稠和滞后：颗粒形状的影响

受非布朗颗粒在各种工业和自然现象中的重要性的影响，各种研究都考虑了非布朗颗粒致密悬浮液的流动问题。本研究探讨了多面体形态对丙烯酸酯颗粒非布朗悬浮液的剪切增稠、剪切堵塞和滞后特性的影响。通过基于光聚合的方法制造了具有相同化学性质和三种不同形状的颗粒：球形（纵横比 Γ = 1）、椭圆抛物面形（Γ ≈ 1）和船形（Γ ≈ 3）。所研究的悬浮液在低剪切应力下表现出剪切稀化行为，而在较高的剪切应力范围内则表现出剪切增稠行为。此外，多面体颗粒悬浮液的剪切增厚强度也有所提高，这可能是由于颗粒间摩擦接触程度提高所致。此外，研究还发现，角度不仅使预测的无摩擦和摩擦干扰堆积分数降低，而且还扩大了剪切干扰堆积分数的范围。最后，由于在上升和下降流动模式中形成的颗粒空间结构不同，在所有样品中都观察到了与历史相关的滞后现象。所观察到的滞后环强烈依赖于体积分数，并且由于颗粒的流动空间受限，滞后环会在干扰填料分数附近减小。此外，在上升流动模式下，细长颗粒的翻滚也会提高粘度，从而减小滞后环，因为在上升流动模式下，颗粒的结构尚未完全形成。

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 Rheology 物理-力学

CiteScore

6.60

自引率

12.10%

发文量

100

审稿时长

1 months

期刊介绍： The Journal of Rheology, formerly the Transactions of The Society of Rheology, is published six times per year by The Society of Rheology, a member society of the American Institute of Physics, through AIP Publishing. It provides in-depth interdisciplinary coverage of theoretical and experimental issues drawn from industry and academia. The Journal of Rheology is published for professionals and students in chemistry, physics, engineering, material science, and mathematics.

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