High speed two-phase flow, 1. Theory on axial change of flow parameters and critical flows

The author has proposed a new theoretical method for analyzing two-phase flashing flow. Two independent energy equations were used, one related to the unit flowing weight of the two-phase mixture and the other to its unit existing weight. This method can be applied to any one-component, two-phase flow, from subcritical to supercritical, provided the following basic assumptions are satisfied: (1) One-dimensional flow, (2) Steady flow, (3) Adiabatic flow, (4) Gravity force is negligible, (5) Thermally saturated flow. Two-phase critical flow can be determined as a maximum weight velocity flow, corresponding to the conditions dictated by the high pressure reservoir tank. Numerical calculations of critical parameters show good agreement with the experimental values. (author)