Vapor locking and heat transfer under transient and steady state conditions

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The study was undertaken to determine the vapor locking in the cooling channels of a cryostable superconducting magnet, to investigate the heat transfer characteristics under steady state and transient conditions, and to study the effects of vapor accumulation of the multiple coil layers. Based on the experimental results obtained the following conclusions can be made: (1) the critical steady state heat flux for the transition from nucleate boiling to film boiling is about 0.4 w/cm/sup 2/; (2) the critical transient energy density for the boiling transition is about 100 mJ/cm/sup 3/; (3) the front channel is easier to reach the ... continued below

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Pages: 18

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Chen, C J; Wang, S T & Dawson, J W January 1, 1979.

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Description

The study was undertaken to determine the vapor locking in the cooling channels of a cryostable superconducting magnet, to investigate the heat transfer characteristics under steady state and transient conditions, and to study the effects of vapor accumulation of the multiple coil layers. Based on the experimental results obtained the following conclusions can be made: (1) the critical steady state heat flux for the transition from nucleate boiling to film boiling is about 0.4 w/cm/sup 2/; (2) the critical transient energy density for the boiling transition is about 100 mJ/cm/sup 3/; (3) the front channel is easier to reach the film boiling regime than rear channel, due to that the wetted area of front side is more than the wetted area of rear side; and (4) no temperature rise greater than 1/sup 0/K is possible if the heat flux does not exceed the critical heat flux under steady state condition or the energy density does not exceed the critical energy density under transient condition.

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Pages: 18

Notes

Dep. NTIS, PC A02/MF A01.

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  • Cryogenic engineering conference, Madison, WI, USA, 21 Aug 1979

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  • Report No.: CONF-790815-19
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6007451
  • Archival Resource Key: ark:/67531/metadc1100403

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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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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 18, 2018, 5:23 p.m.

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Chen, C J; Wang, S T & Dawson, J W. Vapor locking and heat transfer under transient and steady state conditions, article, January 1, 1979; Illinois. (digital.library.unt.edu/ark:/67531/metadc1100403/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.