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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
Universal scaling law for jets of collapsing bubbles
D Obreschkow1, M Tinguely, N Dorsaz
1Laboratoire des Machines Hydrauliques, EPFL, Lausanne, Switzerland.
Physical Review Letters
|December 21, 2011
Summary
Cavitation bubble collapse generates vapor jets. Their normalized volume depends on pressure gradient and bubble size, not liquid properties, and is linked to jet penetration.
Area of Science:
- Fluid Dynamics
- Bubble Dynamics
- Cavitation Physics
Background:
- Cavitation bubbles collapsing in pressure gradients create microjets and vapor jets.
- Understanding vapor jet formation is crucial for various fluid mechanics applications.
Purpose of the Study:
- To present unprecedented observations of vapor jets formed in a uniform gravity-induced pressure gradient.
- To investigate the factors influencing vapor jet volume and penetration.
Main Methods:
- Experiments conducted aboard parabolic flights to modulate gravity-induced pressure gradients.
- Analysis of vapor jet characteristics, including volume and dependence on physical parameters.
Main Results:
- Normalized vapor jet volume is independent of liquid density and viscosity.
- Normalized jet volume is proportional to the dimensionless parameter ζ = |∇p|R(0)/Δp.
- Surface tension shows negligible dependence on jet formation.
Conclusions:
- A derived law, inspired by Kelvin-Blake considerations, confirms the observed relationship for jet volume.
- A conjecture is proposed: jet penetration of the bubble boundary occurs when ζ ≳ 4 × 10(-4).
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