Download presentation

Presentation is loading. Please wait.

Published byEliseo Laine Modified over 2 years ago

1
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

3
About cavitation Cavitation bubbles Implosion phenomena Concerned technologies Damage

4
Goal Confined shockwave Observe all liquid jets Interaction with spherical free surface Water Drop Cavitation Bubble

5
Here we go !

6
Part I Water Drop

7
Drop Formation & Fixation

8
Drop Growth 10 mm

9
Drop Oscillations 1/e damp out time = 0.7s

10
Drop-Electrodes Interaction Negligible interaction Repulsion by electrodes Attraction by electrodes

11
Part II Cavitation Bubble

12
It’s really fast !

13
Close-up

14
Stability of Drop and Free Surface

15
Counterjet Geometry Planar free surface (ground experiment) Spherical free surface (microgravity experiment) bubble [Robinson et al. 01] Free Surface High pressure Numerical Simulation

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

17
Implosion Process Modified Rayleigh-Plesset equation (empty bubble): R b (t) R d (t)

18
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

19
FLASH & SPLASH !

20
Appendix

21
Flight Maneuver

22
Global Evolution

23
Bubble inside extended volume on ground Rayleigh-Plesset equation (empty bubble)

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google