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Two-Phase Flow Modeling in Microchannels and Minichannels

机译：微通道和迷你通道中的两相流建模

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摘要

In this article, three different methods for two-phase flow modeling in microchannels and minichannels are presented. They are effective property models for homogeneous two-phase flows, an asymptotic modeling approach for separated two-phase flow, and bounds on two-phase frictional pressure gradient. In the first method, new definitions for two-phase viscosity are proposed using a one-dimensional transport analogy between thermal conductivity of porous media and viscosity in two-phase flow. These new definitions can be used to compute the two-phase frictional pressure gradient using the homogeneous modeling approach. In the second method, a simple semitheoretical method for calculating two-phase frictional pressure gradient using asymptotic analysis is presented. Two-phase frictional pressure gradient is expressed in terms of the asymptotic single-phase frictional pressure gradients for liquid and gas flowing alone. In the final method, simple rules are developed for obtaining rational bounds for two-phase frictional pressure gradient in minichannels and microchannels. In all cases, the proposed modeling approaches are validated using the published experimental data.
机译：本文介绍了三种不同的微通道和迷你通道两相流建模方法。它们是有效的均质两相流动特性模型，渐近建模的独立两相流建模方法以及两相摩擦压力梯度的边界。在第一种方法中，使用多孔介质的热导率和两相流中的粘度之间的一维输运类比，提出了两相粘度的新定义。这些新定义可用于使用均质建模方法来计算两相摩擦压力梯度。在第二种方法中，提出了一种使用渐近分析计算两相摩擦压力梯度的简单半理论方法。两相摩擦压力梯度表示为单独流动的液体和气体的渐近单相摩擦压力梯度。在最终方法中，开发了简单的规则来获得微通道和微通道中两相摩擦压力梯度的合理范围。在所有情况下，建议的建模方法均使用已发布的实验数据进行验证。

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