School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, New South Wales 2006, Australia.
Nat Commun. 2011;2:288. doi: 10.1038/ncomms1289.
Pattern-forming processes in simple fluids and suspensions have been studied extensively, and the basic displacement structures, similar to viscous fingers and fractals in capillary dominated flows, have been identified. However, the fundamental displacement morphologies in frictional fluids and granular mixtures have not been mapped out. Here we consider Coulomb friction and compressibility in the fluid dynamics, and discover surprising responses including highly intermittent flow and a transition to quasi-continuous dynamics. Moreover, by varying the injection rate over several orders of magnitude, we characterize new dynamic modes ranging from stick-slip bubbles at low rate to destabilized viscous fingers at high rate. We classify the fluid dynamics into frictional and viscous regimes, and present a unified description of emerging morphologies in granular mixtures in the form of extended phase diagrams.
已经对简单流体和悬浮液中的成核过程进行了广泛的研究，并确定了类似在毛管主导流中出现的粘性指和分形的基本驱替结构。然而，在摩擦性流体和颗粒混合物中基本的驱替形态尚未被确定。在这里，我们考虑了流体动力学中的库仑摩擦力和可压缩性，发现了令人惊讶的响应，包括高度间歇性的流动和向准连续动力学的转变。此外，通过在几个数量级上改变注入速率，我们描述了从低速下的粘滑泡到高速下不稳定的粘性指的新的动力学模式。我们将流体动力学分类为摩擦区和粘性区，并以扩展相图的形式呈现了颗粒混合物中新兴形态的统一描述。
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