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Simulations par mécanique des fluides numérique d'un réfrigérateur à tube à pulsation à orifice : les effets de la fréquence de fonctionnement.

Computational fluid dynamics simulations of an orifice type pulse tube refrigerator: Effects of operating frequency.

Auteurs : ANTAO D.S., FAROUK B.

Type d'article : Article

Résumé

A numerical study is reported here for the investigation of the fundamental flow and heat transfer processes found in an orifice type pulse tube refrigerator (OPTR). The OPTR is driven by a cyclically moving piston at one end of the system with helium as the working fluid. The regenerator and the various heat exchangers are modeled as porous media and a thermal non-equilibrium model is applied in these regions. The system is studied for different operating frequencies of the driver piston. The simulations reveal interesting steady-periodic flow patterns that develop in the pulse tube due to the fluctuations caused by the piston and the presence of the inertance tube. The predicted secondary-flow recirculation patterns in the pulse tube are found to affect the OPTR performance. When the secondary-flow patterns are well-developed, they help isolate the cold and hot ends of the pulse tube and create a thermal buffer zone at the center of the pulse tube, enhancing the performance of the OPTR.

Détails

  • Titre original : Computational fluid dynamics simulations of an orifice type pulse tube refrigerator: Effects of operating frequency.
  • Identifiant de la fiche : 30001167
  • Langues : Anglais
  • Source : Cryogenics - vol. 51 - n. 4
  • Date d'édition : 04/2011
  • DOI : http://dx.doi.org/10.1016/j.cryogenics.2011.02.001

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