Bubble-Jets in Gravitational Fields (APS DFD Video V060)

TL;DR

This paper visualizes how gravity influences bubble collapse and jet formation in liquids, revealing a universal scaling law relating jet size to gravity and bubble parameters across different gravity conditions.

Contribution

It introduces a new scaling law linking bubble jet size to gravity and bubble parameters, applicable across various gravity environments.

Findings

Gravity significantly affects cavitation bubble jets.

A universal scaling law for jet size is established.

The law applies to any uniform pressure gradient.

Abstract

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).