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Abstract
Two-phase flow nozzles are used in the total flow systems of geothermal power plants and in the ejector refrigeration cycle. The purpose of the present study is to theoretically elucidate the characteristics of expansion waves at the outlets of supersonic two-phase flow nozzles. Two-dimensional basic equations for compressible two-phase flow were derived by incorporating the equation of momentum transfer between the phases into equations of gas dynamics. In this study, the theoretical analyses were carried out by focusing on momentum-relaxation phenomena in high-speed vapor-mist flow. Expansion waves occurring right after two-phase flow nozzles were calculated by using the CIP method. The calculated expansion curves were compared with the experimentally obtained curves, and the two showed close resemblance.