Journal of Japan Society of Fluid Mechanics

Online ISSN : 2185-4912
Print ISSN : 0286-3154
ISSN-L : 0286-3154

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Volume 18, Issue 1

Displaying 1-11 of 11 articles from this issue

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[title in Japanese]

[in Japanese], Wen-Jei Yang

1999 Volume 18 Issue 1 Pages 1-2
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.1

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Simple Models for Complex Flows

[in Japanese], [in Japanese]

1999 Volume 18 Issue 1 Pages 4
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.4

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1999 Volume 18 Issue 1 Pages 5-10
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.5

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[title in Japanese]

[in Japanese]

1999 Volume 18 Issue 1 Pages 11-18
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.11

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[title in Japanese]

[in Japanese]

1999 Volume 18 Issue 1 Pages 19-25
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.19

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[title in Japanese]

[in Japanese], [in Japanese]

1999 Volume 18 Issue 1 Pages 26-30
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.26

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[title in Japanese]

[in Japanese]

1999 Volume 18 Issue 1 Pages 31-36
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.31

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High Concentration Phenomena of SO₂ in the Southern part of Kyushu and Volcanic Plume from Mt.Sakurajima

Mitsushi OHKURA, Masayuki KANEMARU

1999 Volume 18 Issue 1 Pages 37-46
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.37

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Observed ground level concentrations of sulfur dioxide (SO₂) often exceed 100ppb in the southern part of Kyushu. These high concentration phenomena are analyzed in connection with observed concentrations of SO₂ and upper air observations data, surface weather charts and satellite photographs. It is found that high concentration events of SO₂ can be much observed during the daytime when mixing layer has developed. It is confirmed that the volcanic SO₂ emitted from Mt.Sakurajima has a significant contribution to high concentration events of SO₂ in the southern area of Kyushu. Concentrations at the monitoring stations inside Sakurajima island show the high values to the extreme degree. For the other monitoring stations, the influence of volcanic plume from Mt.Sakurajima is small as the distance from Mt. Sakurajima becomes long.

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Necessary Condition of External Disturbances for the Generation of Puffs in a Pipe

Tomoki KOBAYASHI, Isamu HAMADA, Kazuo MATSUUCHI

1999 Volume 18 Issue 1 Pages 47-50
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.47

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A turbulent blob called a puff is generated in a transitional pipe flow. Introducing disturbances of a given intensity, we determined the limits of the disturbance intensity for the generation of the puffs. We also tried to understand the mechanism of the generation of the puffs. It was found that upper and lower limits of the intensity exist for the generation. When the disturbance intensity is stronger above the upper limits, fluctuations decrease near the wall and there is not enough turbulent energy necessary for the generation of puffs. On the other hand, when the disturbance intensity is weaker below the lower limit, the turbulent energy is insufficient even immediately after the introduction of the disturbance. In both cases therefore, no puffs are generated.

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Free Fall of Maple Seeds

Satoshi TOMIOKA, Kimihito YAMANAKA, Ryuji TAKAKI

1999 Volume 18 Issue 1 Pages 51-55
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.51

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[title in Japanese]

[in Japanese]

1999 Volume 18 Issue 1 Pages 56-59
Published: February 28, 1999
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.18.56

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