Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Transparent cryogenic thermosiphon using $N_2\;and\;CF_4$ mixture as the working fluid

  • Lee, Ji-Sung (Cryogenic Engineering Laboratory, Department of Mechanical Engineering, KAIST) ;
  • Jeong, Sang-Kwon (Cryogenic Engineering Laboratory, Department of Mechanical Engineering, KAIST) ;
  • Ko, Jun-Seok (Cryogenic Engineering Laboratory, Department of Mechanical Engineering, KAIST) ;
  • Kim, Young-Kwon (Cryogenic Engineering Laboratory, Department of Mechanical Engineering, KAIST) ;
  • Jung, Se-Yong (Superconductivity and Applications Group, Korea Electric Power Research Institute) ;
  • Han, Young-Hee (Superconductivity and Applications Group, Korea Electric Power Research Institute)
  • Published : 2009.05.31
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Abstract

A mixed working fluid has a potential to widen the operation temperature range of the thermosiphon. In this study, the thermosiphon using $N_2\;and\;CF_4$ mixture as the working fluid is fabricated and tested to verify its transient thermo hydraulic characteristic. A transparent pyrex glass tube was used for the thermosiphon itself and the vacuum chamber was also fabricated by glass to visualize the internal state of thermo siphon. Onset of condensation temperature was related to the partial pressure of $CF_4$. Two solidifications were observed and condensate temperature range of mixed working fluid was from 160K to 70.7K with $N_2$ 25% composition.

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References

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