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Analysis of gas transfer mechanisms due to air bubble and turbulence at the air-water interface

空气-水界面处气泡和湍流引起的气体传递机制分析

基本信息

批准号：
12305031
负责人：
KAKUNO Shohachi
金额：
$ 17.24万
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 (A)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12305031/
关键词：
wave breaking air bubble gas transfer velocity wind-wave air-sea interface PTV high-speed camera void probe 乱流モデル振動格子乱流場超音波

项目摘要

A dual-tip void probe was developed as a extension of standard single void probe. The validity of dual-tip void probe was verified and applied to bubble characteristics induced by breaking wave in the mechanically generated wave in the flume. The amount of gas transfer flowing rate instead of traditional gas transfer velocity was proposed to estimate the gas transfer rate in the surf zone, quantitatively (Kakuno, Shigematsu and Hosoi). The characteristics of turbulence in bubbly flows were measured and analyzed in the experimental facility (Asai). The droplet collision into the water surface was measured using 1 million frame per second ultra-high speed camera. The instability of thin gas film between droplet and water surface shows clear Reynolds number and Weber number dependence (Etoh). The relationship between the surface renewal process and micro scale turbulence has been measured by Particle Image Velocimetry and Laser Induced Fluorescence in a lattice turbulence (Sugihara). The simultaneous visualizations of air and water velocities were conducted in the wind-wave flume. The organized motion of air and water flows were measured and the bursting motions of air flow into the water were observed visually (Takehara, Etoh, Shigematsu and Tsujimoto). The bubble diameter distribution and bubble source functions were measured using Phase-Doppler anemometry in the wind-wave flume. The coherent bubble diameter spectra were measured under the wind-wave breaking (Mori). The field observations of bubble distributions under the wind-wave breaking were investigated using ultra sonic sensor at the upper ocean (Yoshioka). The gas transfer model at the breaking wave interface was proposed as a summary of above results (Moog).

作为标准单孔探针的扩展，开发了双孔探针。验证了双探头空隙探针的有效性，并将其应用于水槽中机械波破碎波诱导气泡特性的研究。提出了用气体输送流量代替传统的气体输送速度来定量估算碎波带气体输送速率的方法（Kakuno，Shigematsu和Hokuo）。在实验装置（Asai）上对泡状流的湍流特性进行了测量和分析。使用每秒100万帧的超高速相机测量水滴碰撞到水面。液滴和水面之间的薄气膜的不稳定性显示出明显的雷诺数和韦伯数的依赖性（Etoh）。本文用粒子图像测速技术和激光诱导荧光技术在晶格湍流中测量了表面更新过程与微尺度湍流之间的关系。同时显示的空气和水的速度进行了风浪水槽。测量气流和水流的有组织运动，并目视观察气流进入水中的爆发运动（竹原、Etoh、Shigematsu和Tsujimoto）。在风浪水槽中，利用相位多普勒测速技术测量了气泡直径分布和气泡源函数。在风浪破碎（Mori）条件下测量了相干气泡直径谱。利用超声波传感器在吉冈海洋上层对风浪破碎条件下气泡分布进行了现场观测。在此基础上提出了破碎波界面处的气体传输模型。