A Three-fluid Model for the Simulation of Counter-Current Stratified Flows in the Hot Leg of a Pressurized Water Reactor

摘要

A three-fluid model of counter-current air-water flow is suggested. The accurate prediction of droplet entrainment in two-phase flows is relevant to calculate interfacial exchange between the fluids. The present study delivers a model based on the constitutive physics for droplet separation considering reentrainment of the dispersed water droplets into the continuous water film. A monodisperse distribution of the droplets is taken into account by means of a transport equation for the droplet number density in order to determine the droplet size.