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 !