Mixing of Confined Jet of Mist Flow

Abstract

The confined jet of two-phase mist flow is important for the development of a two-phase ejector in refrigeration cycle. However, the flow characteristics of the two-phase ejector have not been elucidated to date due to the nonequilibrium of velocity and temperature. In this study, the mixing characteristics of two-phase mist flow in the two-phase ejector were investigated experimentally. The pressure rise in the mixing section and the diffuser of the ejector was measured. The following results were obtained by comparison of the measured pressure rise with that calculated using a simple theory. The increment of the length and the decrement of the diameter of the mixing section were effective for raising the pressure. The energy efficiency of the two-phase ejector used in this experiment was approximately 10%. This efficiency is expected to be increased by the improvement of the mixing characteristics of the ejector and the nozzle efficiency.