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TECHNICAL PAPERS

Influence of Roughness on the Two-Phase Flow Structure of Sheet Cavitation

[+] Author and Article Information
B. Stutz

Université de Pau et des Pays de l’Adour, Avenue de l’Université, 64000 Pau, Francee-mail: stutz@genserver.insa-lyon.fr

J. Fluids Eng 125(4), 652-659 (Aug 27, 2003) (8 pages) doi:10.1115/1.1596240 History: Received March 14, 2002; Revised March 18, 2003; Online August 27, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic diagram of the Venturi-type test section (dimensions are in mm)
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Schematic diagram of the interchangeable bottom of the Venturi-type test section (dimensions are in mm)
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Schematic diagram of the double optical probe (dimensions are in mm)
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Histograms of the local time fraction of the vapor phase β. X is the distance from the throat of the test section along the horizontal axis; Y is the distance from the throat of the test section along the vertical axis.
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Example of cross-correlation function Rab(t) of the optical probe signals
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Examples of velocity histograms
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Chord length lc of vapor structure
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Photograph of sheet cavitation
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Influence of the geometry and the roughness of the base on the relation between the cavity length Lcav and the cavitation number σ=(Pref−Pvap)/(0.5ρVref2). (Cavity length of 80 mm corresponds to cavitation number σref=0.31).
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Time average and standard deviation of the local time fraction of the vapor phase β within the cavity. Cavity length Lcav=80 mm; velocity in the upstream section Vref=12 m/s. The test section is equipped with the reference profile.
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Time average and standard deviation of the velocity. Cavity length Lcav=80 mm; velocity in the upstream section Vref=12 m/s. The test section is equipped with the reference profile.
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Time-averaged chord lengths lc of vapor structures within the cavity. Cavity length Lcav=80 mm; velocity in the upstream section Vref=12 m/s. The test section is equipped with the reference profile.
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Influence of the geometry and the roughness of the bottom on the spatial distribution of void fraction α and of time-average velocity within the cavity (cavity length Lcav=80 mm; velocity in the reference section Vref=12 m/s)
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Influence of the geometry and the roughness of the base on the distribution of the volume flow rate within the cavities. Cavity length Lcav=80 mm; velocity in the reference section Vref=12 m/s.Cq is the volume flow rate coefficient (×103).
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Partitioning of the cavity
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Influence of the geometry and the roughness of the base on the distribution of the momentum flux M within the cavities. Mean cavity length Lcav=80 mm; velocity in the reference section Vref=12 m/s.
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Influence of the geometry and the roughness of the base on the distribution of the skin friction drag F within the cavities. Cavity length Lcav=80 mm; velocity in the reference section Vref=12 m/s.

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