间歇多相流中的强化分散
Enhanced dispersion in intermittent multiphase flow
摘要：
多孔介质中的多相流输运在许多生物、地质和工程系统中起着核心作用。在这里，我们使用数值模拟的输运在不混溶两相流研究分散在多相多孔介质流。虽然在主流方向的分散是类似的单相流，并受多孔介质结构，我们发现，横向分散表现出根本不同的动态。在毛细力的作用下，不同流动路径的反复激活和失活导致间歇流动模式，强烈增强分散。结果表明，横向弥散受流体团簇长度尺度的控制，并与Bond数的平方根、驱动流动的力与表面张力之比成反比.这一结果导致了一个新的标度律多相流动力学输运性能，打开了一系列的基础和工程应用。
英文摘要：
Transport in multiphase flow through porous media plays a central role in many biological, geological, and engineered systems. Here, we use numerical simulations of transport in immiscible two-phase flow to investigate dispersion in multiphase porous media flow. While dispersion in the main flow direction is similar to that of a single-phase flow and is governed by the porous media structure, we find that transverse dispersion exhibits fundamentally different dynamics. The repeated activation and deactivation of different flow pathways under the effect of capillary forces lead to intermittent flow patterns, strongly enhancing dispersion. We show that the transverse dispersion is controlled by the length scale of fluid clusters, and thus inversely proportional to the square root of the Bond number, the ratio of the force driving the flow and the surface tension. This result leads to a new scaling law relating multiphase flow dynamics to transport properties, opening a range of fundamental and engineering applications.
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