超声空化对细微流道中固体颗粒的运动特性研究

doi:10.3901/JME.2022.23.218

机械工程学报 ›› 2022, Vol. 58 ›› Issue (23): 218-226.doi: 10.3901/JME.2022.23.218

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超声空化对细微流道中固体颗粒的运动特性研究

李琛, 袁牧, 许庆铎, 葛江勤, 厉志安

中国计量大学质量与安全工程学院杭州 310018

收稿日期:2021-12-10 修回日期:2022-05-05 出版日期:2022-12-05 发布日期:2023-02-08
通讯作者: 葛江勤(通信作者),男,1989年出生,博士,讲师,硕士研究生导师。主要研究方向为超声空化技术,先进制造技术,超精密加工技术。E-mail:gjq@cjlu.edu.cn
作者简介:李琛,男,1984年出生,博士,副教授,硕士研究生导师。主要研究方向为微流体调控技术,先进制造技术。E-mail:lichen@cjlu.edu.cn
基金资助:
国家自然科学基金(51905515)和浙江省教师专业发展(FX2021023)资助项目。

Study on the Motion Characteristics of Solid Particles in Fine FlowChannel by Ultrasonic Cavitation

LI Chen, YUAN Mu, XU Qingduo, GE Jiangqin, LI Zhian

Department of Quality and Safty, China Jiliang University, Hangzhou 310018

Received:2021-12-10 Revised:2022-05-05 Online:2022-12-05 Published:2023-02-08

摘要/Abstract

摘要： 针对细微流道中的多相流调控问题，研究超声空化效应对微流道内固体颗粒运动特性的影响。利用Fluent有限元技术对空化气泡溃灭的过程进行模拟，得在超声声压作用于近壁区的气泡时，气泡凹陷、破壁、溃灭的演变过程，并对其周围流场的速度矢量分布进行研究，仿真结果显示，空化气泡溃灭能够产生射向壁面的高速微射流，其最大速度达到28m/s，进而确定细微流场观测实验的最优参数；利用高速摄像机对细微流道中气泡的演变过程进行观测实验，并与仿真实验结果进行对照，观测实验结果表明，利用超声空化效应能够实现对固体颗粒向流道壁面运动的有效引导，为实现细微流道的流场调控、提高加工精度等问题提供理论支持。

关键词: 超声空化, 细微颗粒, 微流控, Fluent仿真, 气泡观测实验, 微流体混合

Abstract: Aiming at the problem of multiphase flow control in micro-channels, the influence of ultrasonic cavitation effect on the movement characteristics of solid particles in micro-channels is studied. Using Fluent finite element technology to simulate the collapse process of cavitation bubbles, the evolution process of bubble depression, wall breaking and collapse when ultrasonic sound pressure acts on the bubble near the wall, and the velocity of the surrounding flow field The vector distribution is studied, and the simulation results show that the collapse of cavitation bubbles can produce high-speed micro-jets directed to the wall with a maximum velocity of 28 m/s, and then determine the optimal parameters for the observation experiment of the subtle flow field; Observation experiments on the evolution of bubbles in the flow channel were carried out and compared with the results of simulation experiments. The observation experiment results showed that the use of ultrasonic cavitation effect can effectively guide the movement of solid particles to the wall of the flow channel, in order to realize the flow field of the fine flow channel. Provide theoretical support for issues such as regulation and improvement of processing accuracy.

Key words: ultrasonic cavitation, fine particles, microfluidic, Fluent simulation, bubble observation experiment, microfluidic mixing

中图分类号:

O429

李琛, 袁牧, 许庆铎, 葛江勤, 厉志安. 超声空化对细微流道中固体颗粒的运动特性研究[J]. 机械工程学报, 2022, 58(23): 218-226.

LI Chen, YUAN Mu, XU Qingduo, GE Jiangqin, LI Zhian. Study on the Motion Characteristics of Solid Particles in Fine FlowChannel by Ultrasonic Cavitation[J]. Journal of Mechanical Engineering, 2022, 58(23): 218-226.

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超声空化对细微流道中固体颗粒的运动特性研究

Study on the Motion Characteristics of Solid Particles in Fine FlowChannel by Ultrasonic Cavitation

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