Abstract
This paper presents an analysis of the critical heat flux (CHF) of subcooled flow boiling based on the liquid sublayer dryout mechanism, assuming that it is a similar phenomenon to CHF in pool boiling except for apparent differences between forced and natural convection. Employing the same formula of sublayer thickness as that derived for CHF in pool boiling, a physcial model of CHF is derived with an empirical coefficient relating to the velocity of a vapor blanket sliding on a thin liquid sublayer. Predicted CHF values are compared with experimental data for water, R-12, R-11, nitrogen, helium, and R-113, respectively, suggesting propriety of the present model.
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