Journal of the Visualization Society of Japan
Online ISSN : 1884-037X
Print ISSN : 0916-4731
ISSN-L : 0916-4731
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Volume 32, Issue 126
Displaying 1-5 of 5 articles from this issue
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  • Visualization of multi phase flow
    Je-Eun Choi, Hiromichi Obara
    2012 Volume 32 Issue 126 Pages 1
    Published: 2012
    Released on J-STAGE: July 11, 2013
    DOIhttps://doi.org/10.3154/jvs.32.1
    JOURNAL FREE ACCESS
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  • Visualization of CO2 geological storage by using a microfocus X-ray CT
    Suguru UEMURA, Shohji TSUSHIMA, Shuichiro HIRAI
    2012 Volume 32 Issue 126 Pages 2-7
    Published: 2012
    Released on J-STAGE: July 11, 2013
    DOIhttps://doi.org/10.3154/jvs.32.2
    JOURNAL FREE ACCESS
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      Carbon dioxide (CO2) geological sequestration is an immediately available and technologically feasible method to achieve a substantial reduction in CO2 emissions to the atmosphere. Injected CO2 permeates in deep saline aquifers from the injection point and CO2 migrates upward. In order to evaluate the storage site and assess the CO2 leakage risks and storage costs, fundamental visualization and study of immiscible two-phase flow in sandstone are required. The behavior of CO2 in water-saturated Berea sandstone has been observed using a microfocus X-ray computed tomography with high spatial resolution. Three dimensional CO2 distribution was clearly reconstructed, and the effects of the sandstone micro-heterogeneity was noted. Bedding structure strongly determined the CO2 permeation area, and a strong correlation was seen between the local porosity and CO2 saturation CO2 gradually permeated in the axial direction with increasing saturation in higher porosity beddings. The application of these observations to CO2 sequestration in deep saline aquifers is outlined.
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  • Simultaneous Measurement of Motion and Temperature of Individual Particles in Fluidized Bed with Heat Transfer
    Takuya TSUJI, Takuya MIYAUCHI, Satoshi OH, Toshitsugu TANAKA
    2012 Volume 32 Issue 126 Pages 8-13
    Published: 2012
    Released on J-STAGE: July 11, 2013
    DOIhttps://doi.org/10.3154/jvs.32.8
    JOURNAL FREE ACCESS
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      Fluidized beds are widely used in industrial processes concerned with heat transfer. Different heat transfer mechanisms, such as heat convection between particle and surrounding flow, heat conduction between particle-particle and particle-wall and heat radiation, exist inside of the beds. Each particle has a finite heat capacity and convective and diffusive motion of particle also contribute to the heat transfer in the beds. For the better understandings of heat transfer occurs in fluidized beds, therefore, it is important to know the motion of particles in the particle level. In the present study, a new measurement technique based on the combination of PTV and IR thermography, which enables the simultaneous measurement of motion and temperature of individual particles, is developed and the technique is applied to the flow in a two-dimensional fluidized bed under a spouting condition.
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  • Collective Motion of Particulate Suspension with Concentration Interface
    Shusaku HARADA
    2012 Volume 32 Issue 126 Pages 14-18
    Published: 2012
    Released on J-STAGE: July 11, 2013
    DOIhttps://doi.org/10.3154/jvs.32.14
    JOURNAL FREE ACCESS
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      This article describes collective motion of solid particles in liquid. Some observation cases on collective motion of particles in various engineering fields are introduced. The importance of concentration interface, which is ambiguous interface between particulate suspension and pure fluid, is shown by visualization results of experiments and numerical simulations. The mechanism of collective motion of particles and the role of concentration interface are discussed from the viewpoint of both immiscible and miscible fluids.
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  • Visualization of Turbulent Gas-liquid Two-phase Flows in a Horizontal Channel
    Yuichi MURAI, Yuji TASAKA, Yoshihiko OISHI
    2012 Volume 32 Issue 126 Pages 19-22
    Published: 2012
    Released on J-STAGE: July 11, 2013
    DOIhttps://doi.org/10.3154/jvs.32.19
    JOURNAL FREE ACCESS
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      A variety of gas-liquid two-phase flow patterns observed in a horizontal channel is introduced in the paper. The motivation of the experiment originates from drag reduction technique development for marine vessels in sea water, which requires physical mechanism toward practical utilization. The authors' group carried out high-speed air-water mixture visualization as well as low-speed silicone oil loop experiment so that what the figure of the gas-liquid interfaces imply when we discuss about the mechanism. The series of visualization showed multiple novel interpretation of the mechanism; spanwise clustering of bubbles takes place in laminar bubbly two-phase flow, streamwise striping of bubble distribution is formed in turbulent condition, and chained bubbles with large deformation appear at the intermediate conditions. The difference of the bubble clustering is understood to have a correlation to wall shear stress that has been reduced when clustering becomes strong.
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