Two-component flow study in large-diameter horizontal pipe Page: 4 of 30
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were used to construct a flow regime map using visual observations of the flow patterns
and supplementary data from analysis of 7-densitometer results.
Nitrogen gas and water were metered into a 24-in, pipe (mixing region) 5 ft before the
start of the 15-in. test section. The 99-ft test section contained a camera viewport to
capture the flow patterns. A three-beam Y-densitometer and a video camera were located
at UD of 21 and 71, respectively, from the test section entrance. Void fractions were
measured using the three-beam '-densitometer, which operates on the 7-ray attenuation
technique. The measured void fractions from -densitometer reading were plotted against
the inlet void fractions to indicate the slip factor present during each flow regime. In
addition, the instantaneous measurements of void fractions by the 7-densitometer were
analyzed in an attempt to provide another means of defining different flow regimes. The
video camera was mounted at the drag disk upperview ports. Due to a lack of large
pumping capacity, the tests were transient in nature, and quasi-steady state conditions
were achieved during a portion of the tests.
Although air-water flow patterns in horizontal pipes have been experimentally studied
by a number of investigators, most of these studies were confined to small-diameter pipes.
A common technique for map generation of horizontal flows was published by Weisman
et al. (1979) [41. Weisman examined several systems with varying fluid properties and pipe
diameters (1.- to 5-cm I.D.). The fluid properties and pipe diameter effects are inherent in
Weisman's map. Simpson et al. (1977) 131 studied the behavior of the air-water mixture in
5- and 8.5-in. I.D. pipes.
Draft wSRc-MS-91-393 12/3/91 page 3
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Eghbali, D.A. Two-component flow study in large-diameter horizontal pipe, article, December 3, 1991; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1061780/m1/4/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.