Computer Simulation of Shear-Induced Phase Separation and Rheology in Two-Component Viscoelastic Fluid
Computer Simulation of Shear-Induced Phase Separation and Rheology in Two-Component Viscoelastic Fluid
复制标题
双组分粘弹性流体中剪切诱导相分离和流变学的计算机模拟
DOI：
10.1142/s0217984997000475
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发表时间：
1997
影响因子：
1.9
通讯作者：
T. Okuzono
中科院分区：
文献类型：
--
作者：
T. Okuzono
我们数值研究了剪切流下高于平衡共存曲线的温度下二维聚合物溶液的动力学。我们的模型基于流体动力学的拉格朗日图。我们可以通过引入一种具有自身过去历史记忆的流体粒子，将粘弹性效应纳入模型中。我们进行了计算机模拟，观察到剪切引起的相分离发生，并且系统表现出剪切稀化的流变特性。最显着的结果是，法向应力系数对剪切速率的依赖性在与应力松弛时间的倒数相当的剪切速率下发生变化。我们的结果表明剪切引起的相分离可以改变流变响应的定性特征。
We numerically study the dynamics of polymer solutions in two dimensions at a temperature above the equilibrium coexistence curve under shear flow. Our model is based on the Lagrangian picture of fluid dynamics. We can incorporate viscoelastic effects into the model by introducing a kind of fluid particles which have memories of their own past history. We carry out computer simulations and observe that shear-induced phase separation occur and the system shows a shear thinning rheological property. The most remarkable result is that the dependence of normal stress coefficient on shear rate changes at a shear rate which is comparable to inverse of the stress relaxation time. Our results imply that the shear-induced phase separation can change qualitative features of rheological response.