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Impact du milieu poreux en tant qu'entretoise sur les caractéristiques de transfert de chaleur dans les canaux contenant de l'He II.

Influence of porous spacer on heat transfer characteristics in He II channels.

Auteurs : TAKAHASHI M., OKAMURA T.

Résumé

Cooling performance of superfluid helium (He II) in channels installing porous materials has been investigated experimentally under the atmospheric condition. A porous material is installed as a spacer between the He II channels instead of fibreglass reinforced plastic expecting advantages of fountain effect. When heat generation is occurred in a superconducting coil, the porous material can induce a flow of He II. The authors propose that the test channels and porous spacers are tilted by 30 degrees to activate fountain effect. The lambda transition heat flux of the tilted channels is almost twice larger than that of 1-dimensional calculation which does not take fountain effect into account. When input heat flux is larger than the lambda transition heat flux, generated He I goes up and spreads to lower side of tilted porous spacers and temperature difference between its lower side and upper side can be realized. This temperature difference is expected to activate fountain effect.

Détails

  • Titre original : Influence of porous spacer on heat transfer characteristics in He II channels.
  • Identifiant de la fiche : 2006-0038
  • Langues : Anglais
  • Source : Proceedings of the nineteenth International Cryogenic Engineering Conference. ICEC 19.
  • Date d'édition : 22/07/2002

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