Treatment of Turbulent Mixing between Subchannels in a Hydrodynamic Non-Equilibrium Two-Phase Flow

Abstract

Based on the assumption that the fundamental modes of the fluid transfer between subchannels are turbulent mixing, void drift and diversion cross flow, we have proposed and examined a treatment for the turbulent mixing in a hydrodynamic non-equilibrium two-phase flow. In this treatment, the turbulent mixing rate in such a flow is assumed to be equal to the rate in a hydrodynamic equilibrium state that the flow will attain. In order to obtain data needed for the examination, experiments on the axial variations in tracer concentrations for both phases were made in several non-equilibrium flows. An analysis of the data showed that the assumption and treatment are valid.