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Effects of variable thermophysical properties on flow and energy separation in a vortex tube.

Number: pap. ID: 294

Author(s) : BAGHDAD M., OUADHA A., ADDAD Y.

Summary

This paper considers the numerical simulation and exergy analysis of a vortex tube with temperature-dependent thermophysical properties of air selected as the working fluid. A 3D computational domain has been generated considering the quarter of the geometry and assuming periodicity in the azimuthal direction which was found to exhibit correctly the general behaviour expected from a vortex tube. First, flow and heat transfer within the vortex tube have been determined by solving the conservation equations of continuity, momentum and energy using the second moment closure model (RSM) to model the turbulence effects. Results allow to obtain the flow and heat transfer behaviours within the tube and to compute mean pressures and temperatures at the cold and hot ends. These parameters are used in the exergy analysis to quantify the exergy losses produced within the vortex tube and its exergy efficiency. The models results are compared to experimental data obtained from the literature. Four cases have been considered by changing the inlet air pressure from 200 up to 380 kPa. It has been observed that RSM model is not only capable of predicting fairly well the general flow features but also it is capable of matching correctly the measured cold and hot outlet temperatures.

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Pages: 13 p.

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Details

  • Original title: Effects of variable thermophysical properties on flow and energy separation in a vortex tube.
  • Record ID : 30002431
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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