Vapour-bubble growth in a superheated liquid

Abstract

It is shown that the approximation of a thin thermal boundary layer gives an accurate description of the growth of spherical vapour bubbles in a superheated liquid except for very small superheats. If the further approximations of a linear variation of vapour pressure with temperature and of constant physical properties are made, then scaled variables can be introduced which describe the growth under any conditions. This scaled description is not valid during the early, surface-tension dominated, portion of the growth. The rate of bubble growth for large superheats is somewhat overestimated in the intermediate stage in which both inertial and thermal effects play a role. This overestimate does not lead to a serious error in the radius-time behaviour for ranges of practical interest. The asymptotic, or thermally controlled, stage of growth is accurately described by the scaled formulation.