Bubble-Jets in Gravitational Fields (APS DFD Video V060)
  We show visualizations of the gravity-induced jets formed by spherical bubbles collapsing in liquids subjected to normal gravity, micro-gravity, and hyper-gravity. These observations demonstrate that gravity can have a significant effect on cavitation bubbles. An analysis of the gravity-induced jets uncovers a scaling law between the size of bubble-induced jets and the non-dimensional parameter grad(p)*R0/p, where R0 is the maximal bubble radius and p is the driving pressure. This scaling law applies to any jet formed in any uniform pressure gradient grad(p). 
Danail Obreschkow, Marc Tinguely, Nicolas Dorsaz, Philippe Kobel,   Aurele de Bosset, Mohamed Farhat
physics.flu-dyn