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Water Drops and Cavitation Bubbles in Microgravity

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. About cavitation. Cavitation bubbles. Damage. Concerned technologies. Implosion

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Water Drops and Cavitation Bubbles in Microgravity

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

  2. About cavitation Cavitation bubbles Damage Concernedtechnologies Implosion phenomena

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

  4. Here we go !

  5. Part IWater Drop

  6. Drop Formation & Fixation

  7. Drop Growth 10 mm

  8. Drop Oscillations 1/e damp out time = 0.7s

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

  10. Part IICavitation Bubble

  11. It’s really fast !

  12. Close-up

  13. Stability of Drop and Free Surface

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

  15. Shockwave-Nuclei Interaction 0.0ms 0.08ms 0.16ms Shockwave Energy Potential Energy = 0.95 (± 0.1) Evidence for “Hairjets”

  16. Implosion Process Rb(t) Rd(t) Modified Rayleigh-Plesset equation (empty bubble):

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

  18. FLASH & SPLASH !

  19. Appendix

  20. Flight Maneuver

  21. Global Evolution

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

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