泡沫屈服应力流体中的剪切诱导排水
Shear induced drainage in foamy yield-stress fluids
摘要：
剪切诱导排水泡沫屈服应力流体的研究使用MRI技术。而屈服应力的间隙流体稳定系统在休息时，观察到一个快速排水时，施加水平剪切。结果表明，剪切填隙材料的行为作为一个粘性流体在重力方向上，其有效粘度是由剪切气泡之间的瞬态泡沫膜。在颗粒体系（如泡沫）中，液体流动的经典R^2标度无法捕捉到几种气泡尺寸的结果，因此，这些结果构成了排流和剪切诱导间隙流强耦合的显著证明。此外，泡沫膜被发现是负责排水的意外逮捕，从而不可逆地捕获大量的间隙液体。
英文摘要：
Shear induced drainage of a foamy yield stress fluid is investigated using MRI techniques. Whereas the yield stress of the interstitial fluid stabilizes the system at rest, a fast drainage is observed when a horizontal shear is imposed. It is shown that the sheared interstitial material behaves as a viscous fluid in the direction of gravity, the effective viscosity of which is controlled by shear in transient foam films between bubbles. Results provided for several bubble sizes are not captured by the R^2 scaling classically observed for liquid flow in particulate systems, such as foams and thus constitute a remarkable demonstration of the strong coupling of drainage flow and shear induced interstitial flow. Furthermore, foam films are found to be responsible for the unexpected arrest of drainage, thus trapping irreversibly a significant amount of interstitial liquid.
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