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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

EVALUATION OF CONVECTIVE FILM BOILING MODELS WITH NONEQUILIBRIUM DATA IN TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC8.840
pages 2233-2238

Resumo

In convective film boiling, a high degree of thermodynamic nonequilibrium often occurs between the liquid and vapor phases. By measurement of the vapor superheat at varying distances downstream of the quench front, the axial variation of the vapor generation rate was determined. Contrary to commonly held expectations, the vapor generation rate is high near the quench front in a region of low vapor superheat, and low further downstream of the quench front where the vapor superheat is significantly higher. Comparison of predictions of existing nonequilibrium film boiling models with the data shows that these models are not able to predict the axial variation of the vapor superheat measured in the tests. However, most of the models are able to predict the heat flux data reasonably well. Comparison of a newly developed two-region film boiling model with the data shows substantially better agreement than existing models.