Abstract
The two extremes of two-phase or multiphase flow behavior are displacement of one fluid by another and the concurrent or cocurrent flow of the phases. The relationships for concurrent two-phase or multiphase flow are developable from the dissipative or lost work effects for flow through porous media, which are equivalently a statement of the Darcy's law for each contributing phase. Correlations developed provide a means to calculate or correlate the two-phase pressure-drop in terms of the respective flow rates of the two phases and their properties. The two-phase pressure-drop is prorated in terms of a single-phase pressure-drop. A particular representation is derived based on the Darcy's law for each of the respective phases. Problem in two-phase flow is whether the liquid phase will form a continuum with the gas phase fully dispersed or whether the gas phase will form the continuum with the liquid phase fully dispersed. It can be of significant consequence in vertical flow, where the liquid-phase hydraulic head may or may not exist, depending upon whether the liquid or gas forms the continuum. Thus there can be more to two-phase flow behavior than mere correlations against only the liquid/gas ratio and the respective phase properties.
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