The Flow of Slugs in Horizontal, Two-Phase Pipelines

[+] Author and Article Information
G. E. Kouba, W. P. Jepson

Thermal Hydraulics Division, Harwell Laboratory, Didcot, Oxfordshire, England

J. Energy Resour. Technol 112(1), 20-24 (Mar 01, 1990) (5 pages) doi:10.1115/1.2905707 History: Received March 18, 1989; Revised September 20, 1989; Online April 16, 2008


The flow characteristics in horizontal slug flow are studied experimentally in the Harwell Laboratory 150-mm-dia pipeline. If a frame of reference is taken as moving with the translational velocity of the slug, measurements of the Froude number in the liquid film ahead of the slug were always greater than unity while the Froude number within the slug was in general less than unity. This illustrates a change in flow from super to subcritical flow and the presence of a hydraulic jump. Different types of flow are noticed using high-speed video equipment and these types closely resemble those reported by open-channel hydraulics tests. The distribution of gas in the slug body is only homogeneous at high-mixture velocities and the effect of buoyancy on the gas is more noticeable at low gas velocities. The liquid fraction in the slug is shown to be directly dependent on the Froude number in the liquid film. The ratio of the translational velocity of the slug to the mixture velocity decreases continuously from 2.0 at low-mixture velocities to 1.25 and a mixture velocity of approximately 3m/s. After this point, it remains constant at 1.25.

Copyright © 1990 by The American Society of Mechanical Engineers
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