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arXiv 2603.13611cond-mat.soft
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约束比控制剪切增稠悬浮液的粘度

Constraint ratio controls viscosity in shear thickening suspensions

University of Chicago(芝加哥大学);Harvard University(哈佛大学);Case Western Reserve University(凯斯西储大学)

Qinghao Mao, Michael van der Naald, Abhinendra Singh, Heinrich M. Jaeger

AI总结:

研究通过约束比模型揭示剪切增稠悬浮液粘度增大的机制,利用接触力学与粒径 jamming 物理,提出约束比作为关键控制参数,实现流变数据统一建模。

摘要:

在密集悬浮液受剪切作用下观察到的粘度显著增加,对理解微观接触力学如何转化为宏观流体阻力构成重大挑战。本文引入一种计数约束模型,自然地整合摩擦和维度,无需额外假设,使流变数据能坍缩到通用主曲线上。该模型借鉴干颗粒jamming物理,将接触分为锁定或非锁定状态,定义单一状态变量——约束比,衡量每颗粒的平均机械约束强度。通过将约束比作为关键控制参数,该框架为预测建模和剪切增稠材料的理性设计提供了统一途径。

英文摘要:

The dramatic viscosity increase observed in dense suspensions under shear poses a major challenge in our understanding of how microscopic contact mechanics translate into macroscopic flow resistance. Here, we introduce a constraint-counting model that incorporates friction and dimensionality naturally without additional assumptions and allows for collapsing of rheological data onto a universal master curve. In this model, we borrow ideas from dry granular jamming physics and classify contacts as either locked or non-locked to define a single state variable, the constraint ratio, which measures the average strength of mechanical constraint per particle. By identifying the constraint ratio as the key control parameter, our framework provides a unifying route toward predictive modeling and rational design of shear-thickening materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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