流变学
布朗运动
粘度
布朗动力学
悬挂(拓扑)
剪切速率
剪切减薄
经典力学
机械
剪切(地质)
热力学
物理
材料科学
统计物理学
复合材料
数学
量子力学
同伦
纯数学
作者
Georges Bossis,John F. Brady
摘要
The viscosity of a suspension of spherical Brownian particles is determined by Stokesian dynamics as a function of the Péclet number. Several new aspects concerning the theoretical derivation of the direct contribution of the Brownian motion to the bulk stress are given, along with the results obtained from a simulation of a monolayer. The simulations reproduce the experimental behavior generally observed in dense suspensions, and an explanation of this behavior is given by observing the evolution of the different contributions to the viscosity with shear rate. The shear thinning at low Péclet numbers is due to the disappearance of the direct Brownian contribution to the viscosity; the deformation of the equilibrium microstructure is, however, small. By contrast, at very high Péclet numbers the suspension shear thickens due to the formation of large clusters.
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