Phase coexistence of complex fluids in shear flow
Phase coexistence of complex fluids in shear flow
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DOI：
10.1039/a900245f
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发表时间：
1999-01
影响因子：
3.4
通讯作者：
P. Olmsted;C. Lu
中科院分区：
文献类型：
--
作者：
P. Olmsted;C. Lu
我们提出了一些最近的计算结果的刚性棒状颗粒在剪切流中，基于Doi模型。这是展示剪切稀化流体（聚合物溶液、蠕虫状胶束、表面活性剂溶液、液晶）在剪切流中的一般行为的理想模型系统。我们目前的计算相共存之间的弱对齐（paranematic）和强对齐的阶段，包括在剪切平面和涡度方向（日志滚动）对齐剪切。相共存是可能的，原则上，在共同的剪切应力和共同的应变速率的条件下，对应于不同的取向的相之间的界面。我们讨论解决这个简并的参数。相共存的计算依赖于动力学运动方程中的非齐次项的存在，其选择适当的共存状态对。我们铸造这个条件的一个等效的动力系统，并探讨如何从平衡相共存不同的一些方面。
We present some results of recent calculations of rigid rod-like particles in shear flow, based on the Doi model. This is an ideal model system for exhibiting the generic behavior of shear-thinning fluids (polymer solutions, wormlike micelles, surfactant solutions, liquid crystals) in shear flow. We present calculations of phase coexistence under shear among weakly-aligned (paranematic) and strongly-aligned phases, including alignment in the shear plane and in the vorticity direction (log-rolling). Phase coexistence is possible, in principle, under conditions of both common shear stress and common strain rate, corresponding to different orientations of the interface between phases. We discuss arguments for resolving this degeneracy. Calculation of phase coexistence relies on the presence of inhomogeneous terms in the dynamical equations of motion, which select the appropriate pair of coexisting states. We cast this condition in terms of an equivalent dynamical system, and explore some aspects of how this differs from equilibrium phase coexistence.