Abstract
A method for predicting steady state dispersed vertical upflow film boiling heat transfer under constant heat flux conditions is presented. Differential transport equations and accepted heat transfer correlations are used to form a solution dependent upon knowledge of conditions at the dryout point only. Thermal nonequilibrium is included in the analysis and the actual flow quality is determined from local equilibrium conditions. A nondimensional grouping is derived which indicates the extent of nonequilibrium present in the flow. Results of this analysis are compared to data of three fluids in tube geometry: Freon 12, nitrogen, and steam. Predictions compare favorably with data from all three fluids.
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