Numerical Analysis of Hot Ends Length Effect on the Performance of Energy Separation in Vortex Tube

Zhong Ye Wu; Xiang Jun Fang; Wen Long Sun

doi:10.4028/www.scientific.net/AMR.732-733.120

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 732-733Numerical Analysis of Hot Ends Length Effect on...

Numerical Analysis of Hot Ends Length Effect on the Performance of Energy Separation in Vortex Tube

Abstract:

In this paper, effects of the vortex tube hot end lengths on the performance are studied, using a three-dimensional numerical fluid dynamic model. The hot end and cold end structure of vortex tube adapts the conical tube with the dilated side connecting a straight pipe. Structural mesh is employed. Different turbulence models are used, compared with experiment, considered of convergence and computing time, eventually, SST model is applied. In contrast to experimental data, numerical results are acceptable. By numerical analysis, it is observed that as the length of hot ends increases, the performance of energy separation increases significantly. However, while the length diameter ratio is more than 20, the performance does not increase any more. Even, it begins to decrease. Meanwhile, different hot end lengths flow is compared, and attemptable analysis is conducted to the flow phenomenon.

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Periodical:

Advanced Materials Research (Volumes 732-733)

Pages:

120-126

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.732-733.120

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Online since:

August 2013

Authors:

Zhong Ye Wu, Xiang Jun Fang, Wen Long Sun

Keywords:

Energy Separation, Length Diameter Ratio, Structure, Turbulence Model, Vortex Tube

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References

[1] The SST model is employed due to its better advantages

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[2] With hot ends length increasing, the performance of energy separation gets better. While the length diameter ratio is more than 20, the performance does not increase any more. Even, it begins to decrease

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[3] If the hot end is short, gas flows out from hot end at the large tangential velocity that makes energy not separate fully, so the efficiency gets worse. On the contrary, if the length of hot end gets longer, the tangential velocity will get smaller, and the energy separates become fuller, so the efficiency gets better. But the too long tube results in the disappearance of vortex and drop of energy separation performance since the mixture of hot flow and cold flow. REFERENCES

DOI: 10.1016/j.egypro.2014.07.306

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