论文标题
在非植物剪切下的致密竞标悬浮液
Dense bidisperse suspensions under non-homogenous shear
论文作者
论文摘要
我们研究了在不均匀的剪切流动下，在三个维度上的二散悬浮液的流变行为，这是由线性剪切和正弦曲线障碍的叠加制成的。我们的结果表明，i）仅在剪切平面中的流向干扰通过实质上降低相对粘度来改变悬浮液动力学，ii）毫无振幅，振幅确定了启动效果的阈值及其启动的阈值，并控制了减少量的量以及两个阶段的哪个阶段受到影响。我们表明，iii）流变学变化是由两个阶段的有效分离引起的，而在单独的区域中，大或小颗粒分层。我们对相位分离过程以及触发它所需的条件提供了物理解释。我们在整个流曲线中测试结果，并表明该机制基本不变，唯一的区别是通过相分离修饰的粒子之间相互作用的性质。
We study the rheological behaviour of bidisperse suspensions in three dimensions under a non-uniform shear flow, made by the superimposition of a linear shear and a sinusoidal disturbance. Our results show that i) only a streamwise disturbance in the shear-plane alters the suspension dynamics by substantially reducing the relative viscosity, ii) with the amplitude of the disturbance determining a threshold value for the effect to kick-in and its wavenumber controlling the amount of reduction and which of the two phases is affected. We show that, iii) the rheological changes are caused by the effective separation of the two phases, with the large or small particles layering in separate regions. We provide a physical explanation of the phase separation process and of the conditions necessary to trigger it. We test the results in the whole flow curve, and we show that the mechanism remains substantially unaltered, with the only difference being the nature of the interactions between particles modified by the phase separation.
