The mixing process model was improved according to the velocity field distribution inside ejector, and the critical/sub-critical ejector model based on 2-D velocity field was established. The critical back pressures and entrainment ratios in critical/sub-critical condition were calculated using R141 b as working fluid. Calculated results were compared with experimental data. The results show that the average errors of theoretical critical entrainment ratios and critical back pressures are 4.63% and 3.8%, re...
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