Transactions of the Visualization Society of Japan
Online ISSN : 1346-5260
ISSN-L : 1346-5252
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Volume 31, Issue 7
Displaying 1-2 of 2 articles from this issue
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  • Visualization of a Round Vortex Ring Interacting with a Density Interface
    - Simultaneous Images in Axis-symmetrical and Cross-sectional Planes -
    Hiroyuki TSUNODA, Masashi HOSAKA, Seiya AMANO
    2011 Volume 31 Issue 7 Pages 21-26
    Published: 2011
    Released on J-STAGE: August 01, 2011
    DOIhttps://doi.org/10.3154/tvsj.31.21
    JOURNAL FREE ACCESS
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    Deformation process of a laminar round vortex ring interacting with a sharp density interface was observed experimentally by means of the flow visualization technique based on the PLIF method. Simultaneous images both in a meridian plane and in a cross-sectional plane perpendicular to the ring axis were captured during the interacting process. For the relatively 'weak' vortex ring compared with the density difference, a second oppositely-signed vortical structure was generated soon after penetrating through the interface and then a circumferentially wavy structure was observed to appear before the ring started to collapse.
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  • A bubble entrainment by a small refrigerant drop impact on water surface
    Hisanobu Kawashima, Ryota Shibasaki, Tsuneaki Ishima
    2011 Volume 31 Issue 7 Pages 27-32
    Published: 2011
    Released on J-STAGE: August 01, 2011
    DOIhttps://doi.org/10.3154/tvsj.31.27
    JOURNAL FREE ACCESS
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    The impact behavior is a fundamental phenomenon because it can be seen several research fields. Then, the impact behavior of a small refrigerant drop on water surface was visualized by using high-speed video camera. The refrigerant liquid was attached inside of the concavity in after impacting. Afterward the refrigerant liquid collected in the bottom of the concavity. The shape of the concavity was consisted of the two frustums. One was for air and another was for refrigerant liquid. A refrigerant drop with a small bubble, which was trapped inside of the refrigerant drop, fell in water. When the dropping height was changed from 70mm to 150mm, the both of sizes of falling refrigerant drop in water and a trapped bubble were independent from the initial height.
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