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

Author(s) : BENKHEIRA L., BAUDOUY B., SOUHAR M.

Type of article: Article

Summary

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].

Details

  • Original title: Heat transfer characteristics of two-phase He I (4.2 K) thermosiphon flow.
  • Record ID : 2007-2445
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 50 - n. 17-18
  • Publication date: 2007/08

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