The influence of bubble size on void function distribution in subcooled flow boiling at low pressure

The effect of bubble size on void fraction distribution in subcooled flow b oiling in a vertical annular channel at low pressure is studied numerically . It is found that a simple linear formula used by Anglart and Nylund [1] a nd adopted in Reference [2] for calculation of bubble size as a function of local subcooling lacks a physical and experimental basis limiting the gene ral application of the model for predicting subcooled flow boiling. A bubbl e size correlation proposed by Zeitoun and Shoukri [3] has been employed in this study. The predictions of void fraction profiles and the bubble size distributions, after incorporating the above bubble size correction, show v ery good agreement with the experimental data, (C) 1999 Elsevier Science Lt d.