Two-component flow study in large-diameter horizontal pipe Page: 7 of 30
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from the test section entrance. About 60 tests, with water flow rates of 0.19 to 1.89 m3/s
(3000 to 30000 gpm) and inlet void fractions up to 40%, were carried out .
The video camera was mounted at the drag disk upper view port primarily to observe the
drag disk behavior throughout the test. The lower port was used for illumination by a high
intensity lamp. The three-beam Y-densitometer operated by Y -ray attenuation technique
(see Figure A-1 in Appendix ). This instrument uses a 137Cs radioactive source to emit
three Y-ray beams that pass through the pipe with different angles. The attenuated beams
are then picked up with three Nal detectors. Pressure tapping points were located at
intervals of 20 feet along the test section length. Ultrasonic flowmeters were located in the
test section to measure average volumetric flow rates.
Data acquisition. Data were acquired by an Hewlett Packard-9000 at the rate of 30
samples per second, which establishes an uncertainty in time of 0.0333 seconds. The
basic precision of the data acquisition system was 15 bits plus sign, with a pre- and post-
gain range of 1 to 500 for conversion to engineering units.
Test matrix. The test matrix was designed to simulate the range of flows and void
fractions obtained during 1989 L-Reactor tests and to obtain sufficient data for calibrating
flowmeters and measuring void fractions. The total target volumetric flow rate ranged from
0.19 to 1.89 m3/s (3000 to 30000 gpm) with inlet void fractions of up to 40%. A test
acceptance criteria of 1000 gpm on flow rates and 2% on voids was set.
Discussion of Results
Draft WSRC-MS-91-393 12/3/91 page 6
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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/m1/7/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.