Two-component flow study in large-diameter horizontal pipe Page: 6 of 30
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throttling to obtain the desired flow rates. For the two-component flow tests, nitrogen gas is
injected downstream of the CV1 into the 24-in. mixing region through a specially
designed cross (see Figure 2) which consists of two 3-in. pipes, each with 46 holes of
0.25 in. diameter facing downstream. The gas/water mixture flows through a 24- by 16-in.
reducer into a 99-ft-long test section where the instruments are mounted. The fluid then
passes through a 16- by 24-in. expander and CV2 before it enters the receiver tank where
the air and water separate. Following each run the water is pumped through a filter from
the receiver tank back to the water tank.
Target water flow rates were obtained by measuring the time required for the water tank
level to drop between two level sensors. The calibrated volume between the two level
sensors is 4932.63 gallons with an accuracy of t 0.05%. The time is measured with an
uncertainty of 0.01 seconds.
The nitrogen gas flow rates were determined by measuring the pressure and
temperature of the compressed gas upstream of the five variously sized sonic nozzles
(see Figure 2). Depending on a desired void fraction, a single nozzle or a combination of
up to five sonic nozzles was selected. The sonic nozzles operate in a chocked flow
The 99-ft-long test section contained a camera viewport to capture the flow patterns. A
three-beam Y-densitometer (to measure void fraction) and a video camera (to observe
flow pattern in the non-transparent pipe) were located at L/D of 21 and 71, respectively,
Draft WSRc-MS-91-393 12/3/91 page 5
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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/m1/6/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.