TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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Volume 43, Issue 3
Displaying 1-8 of 8 articles from this issue
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Preface
Feature : Cryogenic Flow Visualization
Review Article
Originals
  • Visualization in Cryogenic Environment: Application to Two Phase Studies
    Bernard ROUSSET, Denis CHATAIN, Laurent PUECH, Pierre THIBAULT, Fran&c ...
    2008 Volume 43 Issue 3 Pages 75-87
    Published: March 25, 2008
    Released on J-STAGE: October 24, 2008
    DOIhttps://doi.org/10.2221/jcsj.43.75
    JOURNAL FREE ACCESS
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    Visualization techniques compatible with low temperature environment are essential in the extension of room temperature techniques to the study of cryogenic flows. Focusing on two-phase fluids, this paper describes several optical tools developed in severe environments (high magnetic field, superfluid flows,...) to access two-phase patterns (meniscus shape, bubbles and droplets, stratified two-phase flows...).
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  • Application of Particle Image Velocimetry for Measuring He II Thermal Counterflow Jets
    Masahide MURAKAMI, Takeshi TAKAKOSHI, Motoki MAEDA, Ryou TSUKAHARA, Na ...
    2008 Volume 43 Issue 3 Pages 88-93
    Published: March 25, 2008
    Released on J-STAGE: October 24, 2008
    DOIhttps://doi.org/10.2221/jcsj.43.88
    JOURNAL FREE ACCESS
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    The particle image velocimetry (PIV) technique was successfully applied for measuring the velocity of a He II thermal counterflow jet. Neutrally buoyant hydrogen-deuterium solid particles were used as tracer particles for PIV measurement. In the application, the normal component velocity was measured. The jet velocity profile and spatial decay of the jet velocity were compared with those of round jets of ordinary viscous fluids. The velocity that was measured near the jet nozzle was compared with the theoretical prediction.
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  • Visualization Study of Superheated He II-superheated He I Interface in a Narrow Channel between Parallel Walls by using Shadowgraph Method
    Suguru TAKADA, Masahide MURAKAMI, Nobuhiro KIMURA, Hisayasu KOBAYASHI
    2008 Volume 43 Issue 3 Pages 94-99
    Published: March 25, 2008
    Released on J-STAGE: October 24, 2008
    DOIhttps://doi.org/10.2221/jcsj.43.94
    JOURNAL FREE ACCESS
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    A study on visualization of superheated He II —superheated He I interface in a narrow channel between parallel walls as a result of heating was investigated using a shadowgraph method. It was confirmed that a superheated state was readily created in the narrow channel that simulates cooling channels of superconducting magnets. Superheated He II-superheated He I interface transiently appeared above 2.0 K up to lambda temperature when applying small heat flux. The boiling accompanying with superheated He II- superheated He I interface that was repeatedly generated and collapsed was found to have a high heat transfer coefficient.
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  • PIV Application in He II Forced Flow Research
    Ting XU, Steven W. VAN SCIVER
    2008 Volume 43 Issue 3 Pages 100-108
    Published: March 25, 2008
    Released on J-STAGE: October 24, 2008
    DOIhttps://doi.org/10.2221/jcsj.43.100
    JOURNAL FREE ACCESS
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    We report an experimental approach for applying the PIV technique to measurements in He II forced flow. The forced flow of He II is created in a 3.5 m long experimental channel within the Liquid Helium Flow Visualization Facility (LHFVF). We demonstrate that micron size solid hydrogen isotope particles are the best choice for tracing He II forced flow. A novel particle seeding device has been developed to form and seed such solid hydrogen isotope particles directly within He II flow. Velocity field measurements of forced flow He II subjected to a constant locally applied heat flux are presented. Results are compared to analysis based on the two-fluid model.
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Technical Note
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