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Water Drops and Cavitation Bubbles in Microgravity 56th International Astronautical Congress 17th October 2005, Fukuoka, Japan D. Obreschkow, P. Kobel, N. Dorsaz, A. de Bosset, C. Nicollier, and M. Farhat

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About cavitation Cavitation bubbles Implosion phenomena Concerned technologies Damage

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Goal Confined shockwave Observe all liquid jets Interaction with spherical free surface Water Drop Cavitation Bubble

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Here we go !

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Part I Water Drop

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Drop Formation & Fixation

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Drop Growth 10 mm

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Drop Oscillations 1/e damp out time = 0.7s

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Drop-Electrodes Interaction Negligible interaction Repulsion by electrodes Attraction by electrodes

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Part II Cavitation Bubble

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It’s really fast !

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Close-up

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Stability of Drop and Free Surface

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Counterjet Geometry Planar free surface (ground experiment) Spherical free surface (microgravity experiment) bubble [Robinson et al. 01] Free Surface High pressure Numerical Simulation

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Shockwave-Nuclei Interaction 0.0ms0.08ms0.16ms Shockwave Energy Potential Energy Evidence for “Hairjets” = 0.95 (± 0.1)

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Implosion Process Modified Rayleigh-Plesset equation (empty bubble): R b (t) R d (t)

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Conclusions Direct Observation of Jet-Pair Counterjet Geometry Change Shockwave Confinement Shockwave Energy Measurement Stable Water Drop Formation Damp Out Oscillations FOLLOW-UP IDEAS: Polarized Light (Schlieren) ! Higher time/space resolution Smaller area of support

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FLASH & SPLASH !

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Appendix

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Flight Maneuver

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Global Evolution

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Bubble inside extended volume on ground Rayleigh-Plesset equation (empty bubble)

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