Experimental analysis of a Ranque-Hilsch vortex tube for optimizing nozzle numbers and diameter

Mohammadi, S ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.applthermaleng.2013.07.043
  3. Publisher: 2013
  4. Abstract:
  5. A brass vortex tube with changeable parts is used to obtain the optimum nozzle intake numbers and diameter. The effects of inlet pressure and CF (cold fraction) are also investigated. Results illustrate that increasing the number of nozzles causes a temperature drop and the optimum nozzle diameter corresponds to quarter of vortex tube diameter. The distance between cold end orifice and nozzle intakes is investigated in this work and it is found that for a better performance, this distance should be decreased. A series of experiments conducted to investigate the CF effect on VT performance and an optimum amount for this parameter is found. A two-dimensional computational fluid dynamics simulation of a VT has been carried out as well. CFD code is applied to investigate the role of nozzle diameter on the temperature separation. The highly rotating flow field structure and its characteristic are simulated and analyzed with respect to various operating inlet pressure ranges and different CFs. Finally, some results of the CFD models are validated by the available experimental data, showing reasonable agreement for future developmentS
  6. Keywords:
  7. Nozzle optimization ; Ranque-Hilsch ; Vortex tube ; Ranque-Hilsch vortex tube ; Rotating flow fields ; Temperature drops ; Temperature separation ; Better performance ; Computational fluid dynamics simulations ; Experimental analysis ; Computational fluid dynamics ; Optimization ; Inlet flow ; Tubes (components) ; Nozzles ; Vortex flow
  8. Source: Applied Thermal Engineering ; Volume 61, Issue 2 , 2013 , Pages 500-506 ; 13594311 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1359431113005474