Numerical Simulation of the Rheological Behavior of Nanoparticulate Suspensions.
Numerical Simulation of the Rheological Behavior of Nanoparticulate Suspensions.
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DOI：
10.3390/ma13194288
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发表时间：
2020-09-25
期刊：
影响因子：
--
通讯作者：
Schilde C
中科院分区：
文献类型：
--
作者：
Finke B;Kwade A;Schilde C
纳米粒子显著改变聚合物或单体树脂的流变性质，对材料的进一步加工产生重大影响。在这一点上，特别是颗粒材料和分散性能对粘度的影响尚未完全了解，但只能在大量的实验努力后在一定程度上凭经验建模。在本文中，未固化的单体环氧树脂，这是充满了勃姆石纳米粒子的数值研究，阐明的工作原理，管理纳米颗粒悬浮液的流变行为，并模拟悬浮液粘度的基础上评估的材料和系统性能。考虑到颗粒表面力和流体动力学相互作用对流变行为的影响，将求解的CFD与DEM相结合。结果表明，由表面力引起的颗粒相互作用会引起颗粒与周围流体之间的速度差，从而导致阻力增加，并导致剪切过程中的额外能量耗散。本文指出了所用模拟方法的局限性，并提出了一种关于Péclet数的修正技术，拓宽了适用范围。通过阐明表面力、剪切速率和所产生的颗粒上的拖曳力之间的相互依赖性，获得了有价值的信息，用于纳米颗粒悬浮液粘度的未来机理建模。
Nanoparticles significantly alter the rheological properties of a polymer or monomeric resin with major effect on the further processing of the materials. In this matter, especially the influence of particle material and disperse properties on the viscosity is not yet understood fully, but can only be modelled to some extent empirically after extensive experimental effort. In this paper, a numerical study on an uncured monomeric epoxy resin, which is filled with boehmite nanoparticles, is presented to elucidate the working principles, which govern the rheological behavior of nanoparticulate suspensions and to simulate the suspension viscosity based on assessable material and system properties. To account for the effect of particle surface forces and hydrodynamic interactions on the rheological behavior, a resolved CFD is coupled with DEM. It can be shown that the particle interactions caused by surface forces induce velocity differences between the particles and their surrounding fluid, which result in increased drag forces and cause the additional energy dissipation during shearing. The paper points out the limits of the used simulation method and presents a correction technique with respect to the Péclet number, which broadens the range of applicability. Valuable information is gained for a future mechanistic modelling of nanoparticulate suspension viscosity by elucidating the interdependency between surface forces, shear rate and resulting drag forces on the particles.
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DOI：
10.1016/j.compositesa.2019.105563
发表时间：
2019-10-01
影响因子：
8.7
作者：
Abliz, Dilmurat;Finke, Benedikt;Ziegmann, Gerhard
通讯作者：
Ziegmann, Gerhard
DOI：
10.1016/j.compositesa.2019.105562
发表时间：
2019-10-01
影响因子：
8.7
作者：
Abliz, Dilmurat;Berg, David C.;Ziegmann, Gerhard
通讯作者：
Ziegmann, Gerhard
影响因子：
2.3
作者：
Dames, B;Morrison, BR;Willenbacher, N
通讯作者：
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影响因子：
2.5
作者：
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通讯作者：
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影响因子：
2.4
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通讯作者：
vanderSchoot, P