Experimental study on the bubble-droplet chain process by using the world fastest high-speed video camera

利用世界最快高速摄像机进行气泡-液滴链过程的实验研究

• 批准号: 15360270
• 负责人: TAKEHARA Kohsei
• 金额: $ 7.49万
• 依托单位: Kinki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360270/
• 关键词: gas transfer; water surfaces; wind waves; bubbles; droplets; 水滴生成; 気泡混入; 表面張力; 粘性; 気泡の破裂; 水滴の衝突; 水表面の物質輸送; 画像トリガー; gas transfer; water surfaces; wind waves; bubbles; droplets; 水滴生成; 気泡混入; 表面張力; 粘性; 気泡の破裂; 水滴の衝突; 水表面の物質輸送; 画像トリガー

Gas transfer at sea surfaces is strongly dominated by disturbances close to the surface. White cap, which appear on the ocean surfaces when wind waves are breaking, is one of the most important processes in the gas transfer mechanisms. In the white caps, many bubbles are entrained into sea water and some of them are lifted up to surface. The bubbles at sea surfaces eventually burst and generate many small droplets. Similarly, some of the droplet fall down to sea surface again. This bubble-droplet chain process was experimentally investigated in this research.A high-speed video camera, of which frame rate is 1,000,000 fps, was developed at Kinki University in 2001. The high-speed video camera is a powerful tool for investigation of the gas transfer at sea surface. In this research, this high-speed video camera was applied to visualization of the fundamental processes of the bubble-droplets chain process. The following processes are picked up as the fundamental processes.(1)Air entrapment under an impacting drop(2)Coalescence speed of two drops(3)Coalescence speed of two bubbles(4)Crown-breakup by the formation of Marangoni holesAnd also the simultaneous plane measurement techniques of air and water flows close to wind wave interfaces was developed by using a Particle Tracking Velocimetry, which was developed at Kinki University.

海面的气体转移在靠近表面的干扰上强烈控制。当风波破裂时出现在海洋表面上的白色帽是气体传输机制中最重要的过程之一。在白色帽子中，许多气泡被夹在海水中，其中一些被抬起到表面。海面的气泡最终破裂并产生许多小滴。同样，一些液滴再次落到海面。在这项研究中，在Kinki University于2001年在Kinki University开发了一个高速摄像机，在这项研究中对这种泡泡链链工艺进行了实验研究。高速摄像机是研究海面汽油传输的强大工具。在这项研究中，这款高速摄像机应用于泡泡链链过程的基本过程的可视化。 （1）在受影响下降的下降下（2）两滴的合并速度（3）两个气泡的合并速度（4）通过形成Marangoni holesant的合并速度（4）同时在使用的平面测量技术相交时，使用粒子互动的空气和风浪互动，这是通过风波互动开发的。 大学。