APPLICATION OF 3-LAYER MODEL ANALYSIS TO SINGLE-COMPONENT 2-PHASE CRITICAL FLOW-THROUGH A CONVERGING NOZZLE - (COMPARISON OF THE EXPERIMENTAL RESULTS FOR STEAM-WATER MIXTURE AND CARBON-DIOXIDE WITH THE CALCULATED RESULTS)

A two-phase critical flow with phase change through a converging nozzl e is investigated and discussed in terms of the applications of three- layer model analysis which has already been reported for a case of two -component two-phase flow by Ochi and Ayukawa. In the theoretical anal ysis of a single-component two-phase flow during rapid phase change, t here are some difficulties arising from the modeling of a complicated flow pattern at the interface. The calculated results using our propos ed model are in good agreement with experimental data of the flow rate and the pressure of carbon dioxide or steam-water mixture flows. The flow properties in each layer through the channel are discussed in com parison with the completely separated flow or the homogeneous flow mod el. It is found that the three-layer model is a useful method for sing le-component two-phase flow undergoing rapid change of state in variab le-area channels.