Two-component flow study in large-diameter horizontal pipe Page: 3 of 30

analysis of Y-densitometer results. The observed flow patterns were defined as dispersed,
plug, or slug flow. The regime map generated was then compared with published flow
pattern maps of Simpson et al. (1977)(3 and Weisman et al. (1979)4).
Simpson's map is based on 127- and 216-mm I.D. (5- and 8.5-in.) horizontal pipe data,
while Weisman's map is based on small-diameter horizontal pipe data (1.2 to 5 cm I.D.)
and different liquid properties. Weisman's overall flow pattern map was published for air-
water mixture in 1-in.-diam. pipe and contains two parameters in the coordinates which
account for fluid properties and pipe diameter effects. Generally, there was good
agreement between the interpretation of flow patterns of our present data and the two
reference maps.
The measured void fractions from Y-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 Y-densitometer were analyzed in an
attempt to provide another means of defining different flow regimes.
The primary objective of the Wyle phase I tests was to obtain sufficient data to calibrate
the ultrasonic flow meters used in 1989 L-Reactor hydraulic tests. The tests were
conducted in a straight, horizontal, 99-ft-long section of 16-in. (O.D.) schedule-40 pipe.
Wyle Laboratories was selected to perform these tests, in part because of their
capabilities for large-scale flow testing with two-component flow. Because there is little
published data on two-phase flow through relevant pipe diameters, the data obtained
Draft wSRc-MS-91-393 12/3/91 page 2

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Eghbali, D.A. Two-component flow study in large-diameter horizontal pipe, article, December 3, 1991; Aiken, South Carolina. ( accessed March 20, 2019), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.

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