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Author: search.filters.author.Dasgupta, Mani SankarSubject: search.filters.subject.NIST Refprop

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    Effect of Motive Nozzle Exit Position in a R-744 Two-Phase Ejector
    (Springer, 2022-01) Dasgupta, Mani Sankar; Yadav, Mani Sankar
    Ejector expansion transcritical refrigeration systems, in general, have an advantage over conventional transcritical refrigeration systems. In this paper, a CFD-based investigation of transonic flow phenomenon for R-744 inside a three-dimensional model of an ejector is presented. Real-gas thermophysical properties of R-744 such as the density, dynamic viscosity, and thermal conductivity are defined as a function of pressure and temperature based on NIST Refprop. Three different motive nozzle exit positions are investigated. A motive nozzle tip position that is near to the mixing section is found to have higher pressure and lower Mach number due to better mixing.