JP Journal of Heat and Mass Transfer
Volume 10, Issue 2, Pages 127 - 142
(November 2014)
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ON UNSTEADY SURFACE TENSION AND VISCOSITY EFFECTS ON BUBBLES GROWTH
S. A. Mohammadein and K. G. Mohamed
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Abstract: This paper presents comparisons between two models which were presented by the authors to describe the growth of a vapour bubble in steady and unsteady cases of surface tension and viscosity. Although these models have better agreements with some experimental data rather than some of previous analytical and numerical solutions, some differences specially in the validity of using these two models in different cases of initial superheats and prediction of the initial and final time of growth and the growth time period.
We find that, at low superheats, the model of steady surface tension and viscosity (CSTV model) is better than the unsteady one (VSTV model), in contrary, at high superheats, VSTV model is better than CSTV model.
Moreover, it is shown that the VSTV model predicts earlier times for initial and final growth times and shorter growth time period, so it is more suitable for the cases of high superheats, in which bubble growth process is rapid. |
Keywords and phrases: vapour bubble growth, variable surface tension, variable viscosity, superheated liquid. |
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