cavitation bubbles and shockwaves in microgravity 57th international astronautical congress 2006,...
TRANSCRIPT
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Cavitation Bubbles and Shockwaves
in Microgravity
57th International Astronautical Congress2006, Valencia, Spain
D. Obreschkow, P. Kobel, N. Dorsaz, A. de Bosset,
C. Nicollier, and M. Farhat
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Cavitation & Erosion
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Experimental Idea
Confined shockwave
Predicted liquid jets
Interaction with spherical free surface
Water Drop
Cavitation Bubble
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Drop Formation & Fixation
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Drop-Electrodes Interaction
Neutral Repulsion Attraction
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Drop Oscillations
1/e damp outtime = 0.7s
www.flashandsplash.ch
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around the drop …
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First Light
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Peculiar Jet Geometry
Phys. Rev. Lett. 97, 094502 (2006)
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Surprising Lifecycle
Phys. Rev. Lett. 97, 094502 (2006)
Equation of Motion:
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Flashing Mist
0.0ms 0.08ms 0.16ms
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Single Microbubble
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Sockwave Simulation
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Simulation versus Observation
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Overview
Counterjet Geometry Change
Lifetime Shortening
Shockwave focusing amplifies 2nd cavitation
"Injector tube" technique is useful
Double-jet observations
…
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Cheers !