One-dimensional mathematical modeling of two-phase ejectors: Extension to mixtures and mapping of the local exergy destruction

The ejector is a process equipment frequently used in refrigeration processes. There currently knowledge gap on the efficiency of ejectors operating with mixtures. To address this gap, we present one-dimensional model for mixtures, defined by spatially distributed mass-, energy- and momentum-balances different zones, which together constitute full geometry. recently developed delayed homogeneous relaxation to describe two-phase transition motive suction nozzles. For evaporation pure CO2 throat nozzle, yields an average error 2.6% critical mass flow rate, significantly lower than equilibrium that has 8.4%. A comparison new experimental data shows both models give excellent predictions rates where condensation occurs throat, below 0.9%. New are presented, regress two parameters correlations momentum transfer between primary secondary stream mixer diffuser sections. This leads accurate reproduction pressure lift five geometries, mean 2.3%. By using nonequilibrium thermodynamics, derive formulae local exergy destruction ejector. largest located mixer, originates streams. profiles through highly non-uniform, deviate from established guidelines energy-efficient design characterized equipartition destruction. reveals potential increase performance suitable adjustments their geometric design. mathematical validated assumed also be valid mixtures rich CO2. We show minute concentrations second component can have significant influence performance. When fixing inlet conditions geometry, demonstrate adding 2% H2 mixture decreases rate 20%, while SO2 increases 1 bar.