起动惯性是非均质流的起源
Start-up inertia as an origin for heterogeneous flow
摘要：
非单调流动曲线一直被认为是复杂流体剪切带流动的必要条件。因此，在简单屈服应力流体中，剪切带被认为是不存在的。最近的空间分辨流变学实验发现，简单的屈服应力流体表现出剪切带状流动剖面。一个提出的机制，这种瞬态剪切带过程的启动一直是一个小的应力不均匀性上升，从实验装置的几何形状。在这里，使用计算流体动力学方法，我们表明，瞬态剪切带可以初始化，即使在均匀应力条件下的流体启动惯性，这样的机制确实是存在于现实的实验条件。
英文摘要：
For quite some time non-monotonic flow curve was thought to be a requirement for shear banded flows in complex fluids. Thus, in simple yield stress fluids shear banding was considered to be absent. Recent spatially resolved rheological experiments have found simple yield stress fluids to exhibit shear banded flow profiles. One proposed mechanism for the initiation of such transient shear banding process has been a small stress heterogeneity rising from the experimental device geometry. Here, using Computational Fluid Dynamics methods, we show that transient shear banding can be initialized even under homogeneous stress conditions by the fluid start-up inertia, and that such mechanism indeed is present in realistic experimental conditions.
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