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Mesures en vélocimétrie par visualisation des particules pour le schéma d'écoulement et le taux de vide dans des écoulements de cavitation de He II et He I.

PIV measurements for flow pattern and void fraction in cavitating flows of He-II and He-I.

Auteurs : HARADA K., MURAKAMI M., ISHII T.

Type d'article : Article

Résumé

Cavitation phenomena in both He I and He II flows were investigated through pressure measurements, the optical visualization method, and particle image velocimetry analysis. Quasi two-dimensional cavitation flows of liquid helium under nearly saturated vapour pressure condition were generated downstream of the throat of a Venturi channel and of a converging jet nozzle. At a sufficiently high flow velocity, the throat pressure falls below the saturated vapour pressure, generating vapour bubbles downstream of the throat. The pressure loss of the He II flows was almost independent of temperature and was larger than that for He I. Large differences in the void fraction between He I and He II was concluded from the result of PIV measurements. The void fraction for He II was larger than that for He I, which was found to be in good agreement with the visualization results. [Reprinted with permission from Elsevier. Copyright, 2006].

Détails

  • Titre original : PIV measurements for flow pattern and void fraction in cavitating flows of He-II and He-I.
  • Identifiant de la fiche : 2006-2807
  • Langues : Anglais
  • Source : Cryogenics - vol. 46 - n. 9
  • Date d'édition : 09/2006

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