Theoretical Analysis for Accelerated Two-Phase Flow : Vol. 2, Two-Phase Critical Flow Condition and the Flow Variables

Abstract

Validity of the accelerated two-phase flow analysis in higher quality or higher pressure regions than in the previous paper is shown, using the wall frictional coefficient and interphase frictional coefficient determined from Ogasawara's experimental results. Convergent-divergent flow analyses are made and a general two-phase critical flow condition is examined. It is shown that |dP/dZ|→∞ should occur at the critical flow point. This is justified by way of the solution of simultaneous differential equations governed by basic law. The relations of two-phase flow variables in the critical flow are obtained. The two-phase critical flow rate is not determined simply in terms of pressure and quality at the critical flow point, but through the flow history to the critical flow occurrence. The source for the misleading relation in the past two-phase flow analysis is also indicated.