Abstract

Incorporating the recently developed correlations for the rates of droplet deposition and entrainment with the film flow model, critical heat flux due to liquid film dryout in annular flow was numerically evaluated. In the present calculations, the predicted critical heat flux is affected not only by the deposition and entrainment rates but also by the entrainment fraction at the transition to annular flow. For this reason, the entrainment fraction at the transition was correlated in terms of the equilibrium entrainment fraction and the dimensionless boiling length. It was demonstrated that the present method is to predict most data of dryout heat flux tested reasonably well.

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