WIT Press


A Study On Thermally Controlled Bubble Growth In A Superheated Liquid With A Thermal Non-equilibrium Cavitation Model Based On Energy Balances On A Fixed Fluid Mass

Price

Free (open access)

Paper DOI

10.2495/MPF150331

Volume

89

Pages

12

Page Range

387 - 398

Published

2015

Size

539 kb

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