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Caractéristiques du transfert de chaleur d'un écoulement diphasique He I (4,2 K) dans un thermosiphon.

Heat transfer characteristics of two-phase He I (4.2 K) thermosiphon flow.

Auteurs : BENKHEIRA L., BAUDOUY B., SOUHAR M.

Type d'article : Article

Résumé

In the framework of the cryogenic cooling system design of a large superconducting magnet under construction at CERN-Geneva, heat transfer in two-phase He I natural circulation loop has been investigated experimentally. The experiments were conducted on a 2 m thermosiphon loop with copper tube of 10 mm inner diameter uniformly heated over a length of 0.95 m. All data were obtained near atmospheric pressure. Evolution of the exit vapour quality and wall superheat as a function of heat flux are presented and analyzed. A comparison between the two-phase heat transfer coefficient hTP determined in our study and the most relevant correlations available in literature is made. Further, we predict hTP with a correlation based on the combining effects of forced convection and nucleate boiling by a power-type asymptotic model. Finally, we present the boiling crisis study and we propose a critical heat flux correlation as a function of channel height to diameter ratio (z/D) to model our experimental results. [Reprinted with permission from Elsevier. Copyright, 2007].

Détails

  • Titre original : Heat transfer characteristics of two-phase He I (4.2 K) thermosiphon flow.
  • Identifiant de la fiche : 2007-2445
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 50 - n. 17-18
  • Date d'édition : 08/2007

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