Numerical investigation of the effect of cooling a hot-tube on the efficiency of vortex tube refrigerators base on CFD analysis

چکیده مقاله

   Energy / temperature separation performance of Ranque-Hilsch vortex tube or simply vortex tube can be improved by cooling the hot-tube of a vortex tube. This paper investigates the effect of cooling (by water) of a hot-tube on a counter-flow vortex tube temperature separation and isentropic cooling efficiency. The CFD model used is a three-dimensional steady state and utilizes the RNG k-ԑ turbulence model. The Computational Fluid Dynamics (CFD) was verified by comparison with experimental data reported in literature. It is observed that the effect of cooling a hot-tube plays an important role in improving the performance of the vortex tube. This effect provided a greater cold temperature difference, , and thus isentropic efficiency in the vortex tube, than uncooled one, for similar operational condition. The results showed that the cold air temperature difference, , and isentropic efficiency with cooled hot-tube are 6.3 to 10.3% and 5.8 to 10.6% higher than uncooled one respectively.

    Energy / temperature separation performance of Ranque-Hilsch vortex tube or simply vortex tube can be improved by cooling the hot-tube of a vortex tube. This paper investigates the effect of cooling (by water) of a hot-tube on a counter-flow vortex tube temperature separation and isentropic cooling efficiency. The CFD model used is a three-dimensional steady state and utilizes the RNG k-ԑ turbulence model. The Computational Fluid Dynamics (CFD) was verified by comparison with experimental data reported in literature. It is observed that the effect of cooling a hot-tube plays an important role in improving the performance of the vortex tube. This effect provided a greater cold temperature difference, , and thus isentropic efficiency in the vortex tube, than uncooled one, for similar operational condition. The results showed that the cold air temperature difference, , and isentropic efficiency with cooled hot-tube are 6.3 to 10.3% and 5.8 to 10.6% higher than uncooled one respectively.

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