Journal of the Visualization Society of Japan

Innovation of Particle Image Velocimetry

Toshio KOBAYASHI, Koji OKAMOTO, Tetsuo SAGA

2000 Volume 20 Issue 77 Pages 107-112
Published: April 01, 2000
Released on J-STAGE: March 04, 2010

DOIhttps://doi.org/10.3154/jvs.20.107

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Toward Practical Three-Dimensional Particle Image Velocimetry

Koichi NISHINO

2000 Volume 20 Issue 77 Pages 113-119
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.113

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"Concerning of Seeding Particle, Illumination and Camera on Image Recording for PIV Measurement"

Masanori MATSUMOTO

2000 Volume 20 Issue 77 Pages 120-125
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.120

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Simultaneous Measurement of Multi-Physical Values Using Visualized Images

Tomohide NIIMI

2000 Volume 20 Issue 77 Pages 126-132
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.126

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Publication by Digital Paper

(How to Generate the Better PDF)

Koichiro KAWANO, Koji OKAMOTO

2000 Volume 20 Issue 77 Pages 133-138
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.133

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Interpolation Method of Velocity Vector Using Pressure Data in PIV

Katsuhiko HOJO, Masayuki KASHIHARA

2000 Volume 20 Issue 77 Pages 139-144
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.139

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The velocities at multiple points in space can be examined simultaneously by Particle Image Velocimetry (PIV) without touching the flow fields. PIV has been studied actively because it is an effective measuring method. But, it is well known that many PIV images are not usually obtained in the neighborhood of an obstacle or a wall surface. Therefore, the reliability of velocity vector obtained in such a location becomes a serious problem.
In this study, we propose the calculation method in which both the optimization technique based on N-S equations and the pressure-information near a wall surface are applied to the velocity vector obtained by PIV to collect the errors included. In this report, it is applied to a two-dimensional cavity flow using the simulation data of pressure and velocity vectors.

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The Selective Image Enhancement by Two-Wave Mixing in Photorefractive Crystals

Takashi KUROIWA, Masahiro YOSHIWARA, Mitsuhito MATSUBARA

2000 Volume 20 Issue 77 Pages 145-149
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.145

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A new method of selective image amplification with two photorefractive BaTiO₃ crystals is proposed and its amplification characteristics is investigated. The gain of beam amplification by using the method is almost equal to the product of gain obtained from each crystals. The blur of images caused by the amplification reveal very small. Using this method, the images are more emphasized than with single BaTiO₃ crystal and amplified images obtained by the selective image amplification are of high quality. It is concluded that this method is very useful for the real time pattern processing.

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Visualization of the Dissolution of a CO₂ Droplet into Pure/Sea Water

Satoshi SOMEYA, Baixin CHEN, Masahiro NISHIO, Koji OKAMOTO, Tsutomu UC ...

2000 Volume 20 Issue 77 Pages 150-157
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.150

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Sequestration of liquid CO₂ into intermediate depth ocean has been considered as a means to reduce atmospheric concentration of this greenhouse gas and to mitigate global warming. The dissolution behavior of CO₂ into pure/sea water was investigated under conditions in the intermediate ocean, that is, high pressure and low temperature. In these conditions, the CO₂ clathrate hydrate film was formed at the interface between CO₂, and (sea) water. The hydrate film has been considered to affect and decrease the dissolution rate.
In the experiments, LIF technique was used. LIF intensity showed pH of CO₂ dissolved water. Therefore, we could know the dissolution rate of CO₂ and the non-uniform two dimensional CO₂ concentration distribution during the CO₂ dissolution with or without the hydrate film in pure/sea water.
The dissolution rate was faster in pure water than in sea water. The dissolution rate with the hydrate became about half of that without hydrate both in case of pure/sea water.

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Visualization Characteristics of a Sharp Focusing Schlieren Method

Yutaka YAMAGUCHI, Masashi KASHITANI, Shinichi WADA, Teruo SAITO

2000 Volume 20 Issue 77 Pages 158-164
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.158

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A sharp focusing schlieren system gives a means for observing any cross section of a flow field, which is perpendicular to the test beam axis of the optical system. This is impossible for a conventional schlieren system. In this study, a sharp focusing schlieren system was designed with referring to the Weinsten's system to investigate visualization characteristics experimentally. A visualization of butane jet from the 0. 5mm exit diameter nozzle was performed. The results show that the instrument has a capability.for visualizing any cross section of the butane jet.

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Reconstruction of Three Dimensional Velocity Distributions from Limited Vectors Using Fuzzy Inference

Toshiyuki TAKAGI, Koji OKAMOTO

2000 Volume 20 Issue 77 Pages 165-171
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.165

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The three-dimensional flow velocity distribution in a transient flow is significantly investigated to analyze the flow characteristics. The flow velocity distributions can be reconstructed by the use of particle images from a PIV (particle imaging velocimetry). However, the three dimensional flow distributions in the whole flow field cannot be measured directly because the observing points of the particles are the order of only 100-1000.
Fuzzy inference method offers a new technique to estimate the whole flow velocity vector fields from a few measured velocity vectors. After the fuzzy inference is constructed by the measured velocity vectors, the parameters of the fuzzy inference are tuned to the continuity equation by the decent method. This technique can be verified by the three-dimensional PIV standard images from the web site (http://www.vsj.or.jp/piv). The effectiveness of the present technique is also demonstrated by the simulation results.

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[title in Japanese]

[in Japanese]

2000 Volume 20 Issue 77 Pages 176-176_1
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.176

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[title in Japanese]

[in Japanese]

2000 Volume 20 Issue 77 Pages 176a-176_1
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.176a

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[title in Japanese]

Hui HU, [in Japanese], [in Japanese], [in Japanese], [in Japanese]

2000 Volume 20 Issue 77 Pages 176b-176_1
Published: April 01, 2000
Released on J-STAGE: July 31, 2009

DOIhttps://doi.org/10.3154/jvs.20.176b

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