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1-D computational model of a motive nozzle for the R744 two-phase ejector.

Author(s) : BANASIAK K., HAFNER A., SMOLKA J.

Summary

The paper presents the results of a theoretical analysis performed for a motive nozzle of a two-phase R744 ejector at steady-state conditions. The model takes into consideration one-dimensional flow of real fluid through the converging-diverging nozzle. The proposed approach allows the determination of one-dimensional distributions of pressure, velocity and density. The simulated profiles take account of local values of the friction coefficient and physical properties of the working fluid, the latter based on the NIST database (REFPROP 8.0). Additionally, the approach allows the consideration of the metastable states of the fluid. The main practical advantage of the model is a possibility to assess the influence of both the geometry and operating parameters on the motive nozzle performance. The results derived from the numerical analysis were compared to the experimental measurements, performed at the test facility equipped with the two-phase ejector. The consistency between measured and simulated values was satisfactory.

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Pages: 2010-2

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Details

  • Original title: 1-D computational model of a motive nozzle for the R744 two-phase ejector.
  • Record ID : 2010-1147
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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