Inhomogeneous Flows of Complex Fluids: Mechanical Instability Versus Non-Equilibrium Phase Transition

G. Porte, J. Berret, J. Harden
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引用次数: 86

Abstract

We briefly review and re-interpret recent experimental results on shear-induced inhomogeneous flows in complex fluids. These are usually explained in terms of a mechanical instability of the non-linear flow regime. However, in at least two respects, the robustness of the two-state banded-flow regime and the kinetics of band formation under shear, they present striking analogies with ordinary field-induced phase transitions in equilibrium systems. We propose a phenomenological explanation of these effects in terms of an effective non-equilibrium potential that accounts for the free energy stored in a viscoelastic material under steady-shear conditions. Within this picture, a shear-thinning non-homogeneous flow can be shown to be a manifestation of some underlying hidden structural transition.
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复杂流体的非均匀流动:机械不稳定性与非平衡相变
我们简要回顾并重新解释了最近在复杂流体中剪切引起的非均匀流动的实验结果。这些通常用非线性流态的机械不稳定性来解释。然而,至少在两个方面,两态带流的鲁棒性和剪切下带形成的动力学,它们与平衡系统中普通的场诱导相变有着惊人的相似之处。我们提出了一个现象学的解释,这些影响的有效的非平衡势,说明自由能储存在粘弹性材料在稳定剪切条件下。在这幅图中,剪切减薄的非均匀流可以被证明是一些潜在的隐藏结构转变的表现。
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