Microstructure and thickening of dense suspensions under extensional and shear flows
Microstructure and thickening of dense suspensions under extensional and shear flows
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拉伸流和剪切流下致密悬浮液的微观结构和稠化
DOI：
10.1017/jfm.2017.469
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发表时间：
2017
影响因子：
3.7
通讯作者：
Martiniello Antonio
中科院分区：
文献类型：
--
作者：
Seto Ryohei;Giusteri Giulio G.;Martiniello Antonio
稠密悬浮液是表现出强剪切增稠和法向应力差的非牛顿流体。使用数值模拟的拉伸和剪切流，我们研究如何流变性能是由流动下建立的微观结构和颗粒之间的相互作用。通过施加拉伸和剪切流，我们可以评估的程度下，上述增厚制度的流型依赖。即使当流动类型的依赖性受到阻碍，非耗散的响应，如正常的应力差，是存在的，并解释了非牛顿行为的稠密悬浮液。
Dense suspensions are non-Newtonian fluids that exhibit strong shear thickening and normal stress differences. Using numerical simulation of extensional and shear flows, we investigate how rheological properties are determined by the microstructure that is built under flows and by the interactions between particles. By imposing extensional and shear flows, we can assess the degree of flow-type dependence in regimes below and above thickening. Even when the flow-type dependence is hindered, non-dissipative responses, such as normal stress differences, are present and characterise the non-Newtonian behaviour of dense suspensions.