Steady-state composition of a two-component gas bubble growing in a liquid solution: self-similar approach

TL;DR

This paper analytically describes the self-similar growth and steady-state composition of a two-component gas bubble in a liquid solution, revealing dependencies on solubility laws and supersaturation conditions.

Contribution

It provides the first analytical expressions for the steady-state composition of a two-component bubble during self-similar growth, including universal formulas for strong supersaturations.

Findings

Steady-state bubble composition depends on solubility laws.

Self-similar growth requires constant bubble composition.

Universal expressions derived for high supersaturation conditions.

Abstract

The paper presents an analytical description of the growth of a two-component bubble in a binary liquid-gas solution. We obtain asymptotic self-similar time dependence of the bubble radius and analytical expressions for the non-steady profiles of dissolved gases around the bubble. We show that the necessary condition for the self-similar regime of bubble growth is the constant, steady-state composition of the bubble. The equation for the steady-state composition is obtained. We reveal the dependence of the steady-state composition on the solubility laws of the bubble components. Besides, the universal, independent from the solubility laws, expressions for the steady-state composition are obtained for the case of strong supersaturations, which are typical for the homogeneous nucleation of a bubble.