Studies on elucidation of the air-water gas transfer mechanism on the surface of breakers and the modeling of it

破碎机表面空气-水气体传递机制的阐明及其建模研究

• 批准号: 10450185
• 负责人: KAKUNO Shohachi
• 金额: $ 7.55万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450185/
• 关键词: bubble; gas transfer; breaker; global warming; PTV; wind waves; turbulence by oscillating grid; microelectrode; 再曝気

・By visualizing breaker image taken by a special video camera, the relation between bubble characteristics and wave characteristic in the breaker zone was analyzed.・The model formula of gas transfer velocity taking the effect of the entrained bubble in the breaker zone was proposed.・An image analysis technology with high-accuracy for measurement of the flow field in the breaker zone was developed.・Applying the laser induced fluorescence, the visualization of the entrainemnet process of CO_2 gas into the water-phase was succeeded.・It was found that the penetration depth of entrained bubbles of the plunging breakers is deeper than that of the spilling breakers.・It was found that the swell in the wind-waves promotes the gas transfer and that the effect of it becomes big as the wave period becomes shorter.・Gas transfer velocity at the water surface under the condition of the vibrating grating turbulent flow field was evaluated. The velocity was found to be controlled by the Large Eddy Model.・Distribution and change of CO_2 and N_2O on the subtropical equator of the Pacific Ocean were clarified.・The modeling of the gas exchange process for the bubbles entrained in the breaker zone was made, and the validity was verified from an experiment under the condition of a single bubble.・It was succeeded to visualize the entrainmenet process of bubbles into water by the breakers from the results of bubble observation in the field using ultrasonic wave and video image shot simultaneously.・State of the art on the studies of air-water gas transfer phenomenon was investigated through the literature.

・通过可视化特殊摄像机拍摄的断路器图像，分析了破裂区域中气泡特性与波动特性之间的关系。 ・提出了气体转移速度的模型公式，提出了在断路器区域中enlet气泡的作用的模型。 ・开发了具有高准确性的图像分析技术，用于测量断路器区域的流场。 ・应用激光诱导的荧光，Co_2气体的Entakemnt过程的可视化成功。评估了振动光栅湍流场的水面速度。发现速度是由大型涡流模型控制的。・阐明了太平洋亚热带平衡器上的Co_2和N_2O的分布和变化。通过文献研究了有关空气 - 水气体转移现象的研究的超声波和视频图像在现场观察结果的破坏者。

项目成果

竹原幸生,江藤剛治 ほか: "風波による炭酸ガスの取り込み過程の可視化"海岸工学論文集. 第46巻. 101-105 (1999)

Yukio Takehara、Goji Eto 等人：“风和波浪吸收二氧化碳过程的可视化”沿海工程论文第 46 卷 101-105（1999 年）。

Kohsei TAKEHARA and Goji ETOH: "A direct visualization method of CO2 gas transfer at water surface"Proc.4th Int.Symp.on Gas Transfer at Water Sufaces. (in press). (2001)

Kohsei TAKEHARA 和 Goji ETOH：“水面 CO2 气体传输的直接可视化方法”Proc.4th Int.Symp.on Water Surfaces Gas Transfer。

TAKEHARA,K.and ETOH T.: "A study on particle identification in PTV-Particle mask correlation method-"Journal of Visualization. Vol.1, No.3. (1999)

TAKEHARA,K.和 ETOH T.：“PTV 中粒子识别的研究 - 粒子掩模相关方法 -”可视化杂志。

G.TSUJIMOTO, S.KAKUNO, T.SHIGEMATSU.K.KURATA, M.ENDOH, and T.HOSOYAMADA: "Numerical simulation of turbulent flows over a new type of reef breakwater with perforations by k-e turbulent model"Proc.Intnl.Conf.Coastal Structures '99. (1999)

G.TSUJIMOTO、S.KAKUNO、T.SHIGEMATSU.K.KURATA、M.ENDOH 和 T.HOSOYAMADA：“通过 k-e 湍流模型对新型带穿孔礁石防波堤上的湍流进行数值模拟”Proc.Intnl.Conf

杉原裕司 ほか: "風波気液界面におけるガス交換係数の評価"海岸工学論文集. 第46巻. 106-110 (1999)

Yuji Sugihara 等人：“风波气液界面气体交换系数的评估”海岸工程论文，第 46 卷，106-110（1999 年）。