Measurements of heat transfer to helium II at atmospheric pressure in a confined geometry

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Recently the enhanced heat removal capability of unsaturated superfluid helium II has been exploited in fusion and accelerator dipole magnets. In superfluid the internal convection mechanism dominates the heat removal process and orientation with respect to gravity becomes of secondary importance. Heat transfer, however, can be influenced by the thermodynamic state of the liquid, especially with regard to possible phase transformations. The transformation from non-saturated He II must involve an He I state before the film boiling transition is experienced. Some steady state measurements of heat transfer to non-saturated He II have been previously reported. In typical magnet designs, cooling ... continued below

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Pages: 10

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Warren, R.P. & Caspi, S. August 1, 1981.

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Description

Recently the enhanced heat removal capability of unsaturated superfluid helium II has been exploited in fusion and accelerator dipole magnets. In superfluid the internal convection mechanism dominates the heat removal process and orientation with respect to gravity becomes of secondary importance. Heat transfer, however, can be influenced by the thermodynamic state of the liquid, especially with regard to possible phase transformations. The transformation from non-saturated He II must involve an He I state before the film boiling transition is experienced. Some steady state measurements of heat transfer to non-saturated He II have been previously reported. In typical magnet designs, cooling passages between turns result from gaps between the electrical insulation, and are typically on the order of a fraction of a millimeter. The purpose of the work reported here is to measure the attenuation of the heat transfer within such a restrictive geometry.

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Pages: 10

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NTIS, PC A02/MF A01.

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  • 1981 cryogenic engineering conference, San Diego, CA, USA, 10 Aug 1981

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  • Other: DE82001752
  • Report No.: LBL-13053
  • Report No.: CONF-810835-33
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5939070
  • Archival Resource Key: ark:/67531/metadc1104328

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • August 1, 1981

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 24, 2018, 7:26 p.m.

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Warren, R.P. & Caspi, S. Measurements of heat transfer to helium II at atmospheric pressure in a confined geometry, article, August 1, 1981; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1104328/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.