Author(s)

M. Nickaeen, T. Jaskolka, S. Mottyll, R. Skoda

Abstract

For high temperature liquids where the bubble growth is heat diffusion controlled, the performance of a thermal non-equilibrium bubble dynamics model is analyzed. The model is based on thermal energy balances of a single bubble within a fixed mass of fluid (elementary cell). A constant mass of undissolved air is considered in the bubble. A spatially homogeneous temperature for both the vapor–air mixture within the bubble interior and the surrounding liquid is assumed. The model accuracy is compared to the well-established Rayleigh–Plesset equation in combination with the heat transfer model by Plesset and Zwick. The results of both models agree very well. Due to the embedding of a bubble in a finite amount of surrounding liquid and its harmless numerical properties, the model is assumed to be very suitable for the straightforward implementation in 3D-CFD codes as a cavitation model which will be carried out in future work.

Keywords

thermal non-equilibrium, superheated liquids, thermally controlled bubble dynamics, multi-phase flow, cavitation model