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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
Cavitation & Erosion
Experimental Idea
Confined shockwave
Predicted liquid jets
Interaction with spherical free surface
Water Drop
Cavitation Bubble
Drop Formation & Fixation
Drop-Electrodes Interaction
Neutral Repulsion Attraction
Drop Oscillations
1/e damp outtime = 0.7s
www.flashandsplash.ch
around the drop …
First Light
Peculiar Jet Geometry
Phys. Rev. Lett. 97, 094502 (2006)
Surprising Lifecycle
Phys. Rev. Lett. 97, 094502 (2006)
Equation of Motion:
Flashing Mist
0.0ms 0.08ms 0.16ms
Single Microbubble
Sockwave Simulation
Simulation versus Observation
Overview
Counterjet Geometry Change
Lifetime Shortening
Shockwave focusing amplifies 2nd cavitation
"Injector tube" technique is useful
Double-jet observations
…
Cheers !