Non-Existence of thick bubble rings at low Weber numbers

TL;DR

This paper proves that thick bubble rings cannot exist at low Weber numbers within the free-boundary capillary Euler equations, emphasizing the role of surface tension in vortex ring behavior.

Contribution

It demonstrates the non-existence of thick bubble rings at low Weber numbers in capillary flows, contrasting with vortex solutions in ordinary Euler equations.

Findings

Thick bubble rings do not exist at low Weber numbers.

Surface tension significantly affects vortex ring solutions.

Spheroidal bubbles approach spherical shape at low Weber numbers.

Abstract

We examine the existence of thick bubble rings within the framework of the free-boundary capillary Euler equations, focusing on the regime of low Weber numbers. Although spheroidal bubbles are known to approach a spherical shape in this limit, the possibility of thick bubble rings persisting at low Weber numbers has remained uncertain. In contrast to the ordinary Euler equations, which admit thick vortex ring solutions, our analysis reveals that the free-boundary capillary Euler equations do not support thick bubble rings at low Weber numbers. This distinction highlights the significant impact of surface tension on the behavior of vortex rings in the capillary regime.