标题： 直毛细管中两相流的有限体积解 显示英文标题

标题： Finite volume solution for two-phase flow in a straight capillary

摘要： 两相流在多边形截面直毛细管中的问题展示了与多孔介质中孔隙尺度位移相关的快速界面运动的许多动态特性。 已知流体惯性在这些位移中很重要，但在通常用于预测宏观流动特性的网络模型中通常被忽略。 本研究提出了一种两相流的数值模型，该模型描述了流体之间界面的空间和时间演化。 该模型基于平均纳维-斯托克斯方程，并被证明在预测圆形毛细管中的毛细上升以及多边形毛细管角落处的吸入过程的复杂动力学方面是成功的。 该模型可以作为更现实的网络模型的基础，这些模型能够捕捉毛细、粘性和惯性力对孔隙尺度界面动力学及相应的宏观流动特性的影响。 显示英文摘要

摘要： The problem of two-phase flow in straight capillaries of polygonal cross section displays many of the dynamic characteristics of rapid interfacial motions associated with pore-scale displacements in porous media. Fluid inertia is known to be important in these displacements but is usually ignored in network models commonly used to predict macroscopic flow properties. This study presents a numerical model for two-phase flow which describes the spatial and temporal evolution of the interface between the fluids. The model is based on an averaged Navier-Stokes equation and is shown to be successful in predicting the complex dynamics of both capillary rise in round capillaries and imbibition along the corners of polygonal capillaries. The model can form the basis for more realistic network models which capture the effect of capillary, viscous and inertial forces on pore-scale interfacial dynamics and consequent macroscopic flow properties.