SLUG FLOW AND ITSTRANSITIONS IN LARGE （弹状流和ITSTRANSITIONS大）.pdfVIP

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SLUG FLOW AND ITSTRANSITIONS IN LARGE （弹状流和ITSTRANSITIONS大）.pdf

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SLUG FLOW AND ITSTRANSITIONS IN LARGE （弹状流和ITSTRANSITIONS大）

Int. J. Multiphase Flow Vol. 19.NO.3, pp. 411-420, 1993 0301-9322/93 $6.00 0.00 Printed in Great Britain. All rights reserved Copyright «: 1993Pergamon Press Ltd SLUG FLOW AND ITS TRANSITIONS IN LARGE-DIAMETER HORIZONTAL PIPES W. P. JEPSONt and R. E. TAYLOR Thermal Hydraulics Division. Harwell Laboratory, Didcot, Oxon OXII ORA, England (Received 18February 1993) Abstract-A flow regime map is compiled for the air/water two-phase flow !n the H~rwel1 30 em dia horizontal pipeline. The transitions differ substantially from those for small-dlameter pipes ~nd ar~ not predicted accurately by any theoretical model. Data on slu~ fTe!uc:ncy,length, holdup, translational velocity and pressure gradient are presented and compared With eXiSting.data. ~e .res~lts show that the pipe diameter has a large effect on all these propertie~. Several ~hangc:sm the distnbution of the phases in large-diameter pipes are reported. These are especlally.prormnent In slug and annular flow. Key Words: slug flow, horizontal flow, gasfliquid flow, transitions 1. INTRODUCTION The simultaneous flow of gases and liquids occurs in many items of process equipment, e.g. boilers, reactors and oil and gas pipelines. Many workers have studied flow in small-diameter pipes, i.e. 2.54 and 5.08 cm dia pipes, but very little data is avail