Circular plunging jets were studied by both void fraction and acoustic techniques. There were two aims: to measure the structure of the jet flow and its regimes as a function of jet speed and free-jet length; and to develop and validate the acoustic measurement technique in the developing flow. Void fractions and bubble count rates were measured in the developing shear layer of a large-size plunging jet The data compared well with a solution of an advective diffusion equation and showed an increased air entrainment rate with increasing free-jet length for The acoustic data were processed by a novel technique to extract both bubble count and bubble size data. Three plunging jet flow regimes were noted. Near inception, acoustic pulses are isolated and indicate individual bubble entrainment as observable visually. Above a characteristic jet velocity, the number of the bubble pulses increases sharply although bubbles are still produced intermittently. At higher velocities, bubble production becomes quasi-continuous. The study suggests that an acoustic technique calibrated through detailed laboratory measurements can provide useful, absolute data in high-void fraction flows. The robust acoustic sensor can then be used in hostile industrial or environmental flows where more delicate instruments are impractical.
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September 2003
Technical Papers
Air Entrainment Processes in a Circular Plunging Jet: Void-Fraction and Acoustic Measurements
H. Chanson, Reader,,
H. Chanson, Reader,
Fluid Mechanics, Hydraulics and Environmental Engineering, Department of Civil Engineering, The University of Queensland, Brisbane QLD 4072, Australia
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R. Manasseh, Senior Research Scientist,
R. Manasseh, Senior Research Scientist,
CSIRO Thermal and Fluid Engineering, P.O. Box 56, Highett VIC 3190, Australia
Search for other works by this author on:
H. Chanson, Reader,
Fluid Mechanics, Hydraulics and Environmental Engineering, Department of Civil Engineering, The University of Queensland, Brisbane QLD 4072, Australia
R. Manasseh, Senior Research Scientist,
CSIRO Thermal and Fluid Engineering, P.O. Box 56, Highett VIC 3190, Australia
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division Oct. 16, 2001; revised manuscript received Mar. 10, 2003. Associate Editor: L. Mondy.
J. Fluids Eng. Sep 2003, 125(5): 910-921 (12 pages)
Published Online: October 7, 2003
Article history
Received:
October 16, 2001
Revised:
March 10, 2003
Online:
October 7, 2003
Citation
Chanson, H., and Manasseh, R. (October 7, 2003). "Air Entrainment Processes in a Circular Plunging Jet: Void-Fraction and Acoustic Measurements ." ASME. J. Fluids Eng. September 2003; 125(5): 910–921. https://doi.org/10.1115/1.1595672
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