Direct Effects of Gravity on Cavitation Bubble Collapse

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Direct Effects of Gravity on Cavitation Bubble
Collapse
58th International Astronautical Congress2007,
Hyderabad, India ESA Student Participation
Program
September 24, 2007
A. de Bosset, D. Obreschkow, P. Kobel, N. Dorsaz,
M. Farhat
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Concerned technologies
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Experimental Setup
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Cavity Life Cycle
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Measuring Energy Distribution
High-speed camera
Pressure sensor
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Why Microgravity?
Benjamin and Ellis in 1967
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Gravity
Buoyancy forces
F ?waterVg
R
Gravity level
Bubble size
Buoyancy forces in R3
Effect in R since
Bubble surface in R2
Smaller Bubbles ? Fewer buoyancy effects
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• Smaller rebound

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• More intense shockwave

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Concluding comments
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?Results appear coherent and conclusive
In Microgravity true cause and effect
relationship can be established