Micro Gas Bubble Generation Using Ultrasonic Wave

利用超声波产生微气泡

• 批准号: 13650210
• 负责人: TAKEMURA Fumio
• 金额: $ 2.3万
• 依托单位: National Institute of Advanced Industrial Science and Technology (AIST) (2002)The University of Tokyo (2001)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650210/
• 关键词: Bubble; Ultrasonic Wave; Capillary wave

Micro gas bubble generation using ultrasonic wave was investigated experimentally. We found that micro bubbles with around 10μm in average are stably generated from a needle in an ultrasonic field when we supply gas through the needle at several μl/min. In this paper, to clarify the mechanism of the micro bubble generation using ultrasonic wave, we measured the size distribution of the bubbles released from the needle with a microscope. We also investigated the effect of the exited frequency of the ultrasonic wave on the average bubble diameter and the applicability of an analytical expression for a droplet atomization to the fragmentation of the bubble. The results reveal that the average bubble diameter decreases as the exited frequency increases. And nonlinearity of capillary wave seems to make the average diameter of the bubbles much smaller than that of atomized droplets.

对超声波产生微气泡进行了实验研究。研究发现，在超声场中，当以几μl/min的速度向针头供气时，针头可以稳定地产生平均孔径在10μm左右的微气泡。为了阐明超声波产生微气泡的机理，我们用显微镜测量了针头释放的气泡的大小分布。我们还研究了超声波发射频率对气泡平均直径的影响，以及液滴雾化解析表达式对气泡破碎的适用性。结果表明，气泡的平均直径随着输出频率的增加而减小。毛细波的非线性似乎使气泡的平均直径比雾化液滴的平均直径小得多。

项目成果

Lift force on a bubble rising near wall in water below Reynolds number of 20

雷诺数低于 20 的水中靠近壁上升的气泡上的升力

• 发表时间: 2002
• 期刊: Transactions of the Japan Society of Mechanical Engineers B 68-670
• 作者: 竹村文男;高木周;松本洋一郎;Fumio TAKEMURA et al.
• 通讯作者: Fumio TAKEMURA et al.

壁近傍を上昇する気泡に働く揚力に対する気泡表面状態の影響

气泡表面状况对作用于靠近壁面上升的气泡的升力的影响

• 发表时间: 2003
• 期刊: 日本機械学会論文集B編 69-682
• 作者: 竹村文男;竹村文男
• 通讯作者: 竹村文男

竹村文男: "上昇球形ガス気泡の気液界面吸着過程に関する研究(第一報)"日本機械学会論文集B編. 69-678. 324-329 (2003)

Fumio Takemura：“上升球形气泡的气液界面吸附过程的研究（第一次报告）”日本机械工程师学会会议录，B版69-678（2003）。

Fumio TAKEMURA, et al.: "Drag and lift force on a bubble rising near a vertical wall in a viscous"Journal of Fluid Mechanics. (印刷中).

Fumio TAKEMURA 等人：“粘性垂直壁附近气泡上升的阻力和升力”流体力学杂志（正在出版）。

Effect of surface condition on lift force on a bubble rising near a wll

表面条件对井附近气泡上升升力的影响

• 发表时间: 2003
• 期刊: Transactions of the Japan Society of Mechanical Engineers B 69-682
• 作者: 竹村文男;竹村文男;Fumio TAKEMURA;Fumio TAKEMURA
• 通讯作者: Fumio TAKEMURA