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Hot outlet pressure predictions in air vortex tubes by thermodynamic and numerical modelling.

Number: 0245

Author(s) : LAGRANDEUR J., MANSOUR A., PONCET S.

Summary

To model the integration of vortex tubes in refrigeration cycles, the knowledge of both outlet pressures is necessary. In this work, a new thermodynamic model based on the momentum conservation in the axial direction predicts the hot outlet pressure of a vortex tube using air. This model is compared to a two-dimensional numerical model. Predictions of the hot outlet pressure at high cold mass fractions are fairly good for both models, but even better for the numerical one. The difference is explained by a different tangential velocity profile at the inlet. However, the numerical model predicts a forced vortex profile just one diameter downstream. With some adjustments, the predictions of the thermodynamic model with the forced vortex assumption are improved. Discrepancies between both models and the experiment remain at low cold mass fraction because of a higher sensitivity to the boundary conditions.

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Pages: 8 p.

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Details

  • Original title: Hot outlet pressure predictions in air vortex tubes by thermodynamic and numerical modelling.
  • Record ID : 30029805
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0245
  • Document available for consultation in the library of the IIR headquarters only.

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