Large bubble rupture sparks fast liquid jet

TL;DR

This paper reports the discovery of fast liquid jets from large bubble ruptures, revealing a gravity-driven energy focusing mechanism with a universal scaling law involving bubble height.

Contribution

It introduces a novel experimental observation of jet formation from large bubbles and proposes a universal gravity-driven scaling law for jet velocity.

Findings

Jet velocity scales with bubble height to the power 3/2

Focusing is gravity-driven and independent of pinch-off singularity

Experimental validation across various fluid properties

Abstract

This Letter presents the novel experimental observation of long and narrow jets shooting out in disconnecting large elongated bubbles. We investigate this phenomenon by carrying out experiments with various viscosities, surface tensions, densities and nozzle radii. We propose a universal scaling law for the jet velocity, which unexpectedly involves the bubble height to the power 3/2. This anomalous exponent suggests an energy focusing phenomenon. We demonstrate experimentally that this focusing is purely gravity-driven and independent of the pinch-off singularity.