Method for Prediction of Pressure Drop and Liquid Hold-Up in Horizontal Stratified Two-Phase Flow in Pipes

摘要

Experimental apparatus was designed and constructed to obtain cocurrent air-water two phase flow in horizontal pipes. The test section, 10 m long, with an inside diameter 54 mm was made of transparent acrylic glass to permit visual observation of the flow patterns. The experiments were carried out under various air and water flow rates in the regime of smooth and wavy stratified flows. Stainless ring electrodes were mounted flush in the tube wall for measuring the liquid hold-up which is defined as the ratio of the cross-sectional area filled with liquid to the total crossectional area of the pipe. Calculation method for predicting the pressure drop and liquid hold-up was developed by using the Taitel and Dukler momentum balance between both phase.The ratio of interfacial friction factor and gas-wall friction factor,(f_i/f_(WG)) was assumed to be constant. With this technique any mathematical model of interfacial friction factor is not necessary. A ratio of f_i/f_(WG) ,which corresponds with the flow conditions, (laminar or turbulent) were presented.