Analysis of Stratified Cocurrent Flow of Gas-Liquid Mixtures in Horizontal Pipes

概要

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A very simple model, as compared with those presented thus far, is developed to describe the stratified cocurrent flow of gas-liquid mixtures in a horizontal pipe. Assum-ing densities of both phases are constant in location, mass and momentum equations are solved to obtain pressure gradient and volume fractions of both phases at steady state. Several experimental data by others are found in good agreements with the calcu-lated results by the model. When the interface is smooth, i.e. the volumetric liquid flux Jι<0.1 ft/s, it is a good approximation to use the Blasius equation to estimate inter-facial shear stress. For 0.1 ?? Jι ?? 1.0 ft/s where the interface is not smooth but ripply or wavy, the Wallis correlation is found applicable. If we assume stratified flow geom-etry for Jι>1.0 ft/s, agreements with experiment cannot be obtained, since the transi-tion to slug or elongated bubble flow has already taken place. The transition from stratified to annular mist flow is found to occur at gas volume fraction α ?? 0.9 regardless of Jι.