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TECHNICAL PAPERS

On the Stability of Parallel Bubbly Cavitating Flows

[+] Author and Article Information
Luca d’Agostino, Fabio Burzagli

Dipartimento di Ingegneria Aerospaziale, Università degli Studi di Pisa, 2 Via Diotisalvi, 56126, Pisa, Italy e-mail: luca.dagostino@ing.unipi.it

J. Fluids Eng 122(3), 471-480 (Apr 25, 2000) (10 pages) doi:10.1115/1.1287036 History: Received March 28, 1999; Revised April 25, 2000
Copyright © 2000 by ASME
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Figures

Grahic Jump Location
Normalized amplitude of radius oscillations of a bubble with high vapor mass fraction (YV=0.995) in water (To=308 K,po=5 kPa and Ro=0.15 mm)
Grahic Jump Location
Vapor mass fraction YV as a function of the temperature To, for several values of the liquid pressure po
Grahic Jump Location
Normalized amplitude of radius oscillations of a “cold” bubble in water as a function of the excitation frequency ωL for several values of the vapor mass fraction YV for Ro=1 mm and po=5 kPa
Grahic Jump Location
Normalized amplitude of radius oscillations of a “warm” bubble in water as a function of the excitation frequency ωL for several values of the vapor mass fraction YV for Ro=1 mm and po=40 kPa
Grahic Jump Location
Schematic of the flow configuration
Grahic Jump Location
Spatial attenuation rate ki* of a shear layer with “cold” bubbles in the compressibility regime as a function of the excitation frequency ω* for several values of the bubble vapor mass fraction YV. In all cases: ωB0G*=12.85,α=0.01,Ro*=0.01,po=5 kPa and Ro=1 mm. The incompressible flow solution (α=0) is also shown for comparison.
Grahic Jump Location
Spatial attenuation rate ki* of a shear layer with “warm” bubbles in the compressibility regime as a function of the excitation frequency ω* for several values of the bubble vapor mass fraction YV. In all cases: ωB0G*=36.5,α=0.01,Ro*=0.01,po=40 kPa and Ro=1 mm. The incompressible flow solution (α=0) is also shown for comparison.
Grahic Jump Location
Spatial attenuation rate ki* of a shear layer with “cold” bubbles in the resonant regime as a function of the excitation frequency ω* for several values of the bubble vapor mass fraction YV. In all cases: ωB0G*=0.39,α=0.00075,po=6 kPa and Ro*=0.1.
Grahic Jump Location
Spatial attenuation rate ki* of a shear layer with “warm” bubbles in the resonant regime as a function of the excitation frequency ω* for several values of the void fraction α. In all cases: ωB0G*=0.28,po=35 kPa,YV=0.4(To=331 K), and Ro*=0.1.
Grahic Jump Location
Spatial attenuation rate k̃i as a function of the excitation frequency ω̃ for a Blasius layer in water containing air bubbles in the compressibility regime (ω̃≪ω̃B0) at several values of the pressure po=1, 5 and 10 kPa. In all cases: α=0.01 and Ro=1 mm. The single-phase incompressible flow solution (α=0) is also shown for comparison.
Grahic Jump Location
Neutral stability curves of the Blasius layer of Fig. 10 for πR=7.5,πB=1.67 and several values of πP=56,000, 126,000, and 252,000. The single-phase incompressible flow solution (α=0) is also shown for comparison.
Grahic Jump Location
Neutral stability curves of single phase and two-phase Blasius layers containing pure air bubbles in water for πP=400,πB=0.034,πR=7.5 and We=0
Grahic Jump Location
Neutral stability curves of single phase and two-phase Blasius layers containing pure air bubbles in water for πP=620,πB=0.034,πR=7.5 and We=0
Grahic Jump Location
Neutral stability curves of single phase and two-phase Blasius layers containing air-vapor bubbles in water for πB=1.67,πR=7.5,πY=0.987 and several values of πP
Grahic Jump Location
Neutral stability curves of single phase and two-phase Blasius layers containing air-vapor bubbles in water for πB=1.67,πR=7.5,πP=56000 and several values of πY

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