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过程工程学报 ›› 2021, Vol. 21 ›› Issue (8): 865-876.DOI: 10.12034/j.issn.1009-606X.220341

• 微纳米气泡 • 上一篇    下一篇

微分散法连续制备微气泡的研究进展

谢冰琪1,2， 周才金2， 黄小婷2， 马向东1， 张吉松2*   

  1. 1. 中国矿业大学（北京）机电与信息工程学院，北京 100083

    2. 清华大学化学工程系化学工程联合国家重点实验室，北京 100084

  • 收稿日期:2020-10-19 修回日期:2021-02-01 出版日期:2021-08-28 发布日期:2021-08-24
  • 通讯作者: 张吉松 jiszhang@tsinghua.edu.cn
  • 基金资助:
    燃煤超细微粒的生成与控制机理研究;科技部重点研发项目

Research progress of continuous generation of microbubbles by microdispersion

Bingqi XIE1,2,  Caijin ZHOU2,  Xiaoting HUANG2,  Xiangdong MA1,  Jisong ZHANG2*   

  1. 1. School of Mechanical Electronic and Information Engineering, University of Mining and Technology (Beijing), Beijing 100083, China

    2. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

  • Received:2020-10-19 Revised:2021-02-01 Online:2021-08-28 Published:2021-08-24
  • Contact: Zhang JisongJisong jiszhang@tsinghua.edu.cn

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摘要： 微气泡的尺寸介于1~1000 μm之间。相比于传统大气泡，微气泡具有体积小、比表面积大、上浮速度慢和传质效率高等优点，被广泛应用于石油、化工、食品、化妆品、医学和废水处理等领域。相比于传统的微气泡制备方法，气液微分散法制备微气泡生产效率高、可控性好、灵活性高和易于放大，受到了学者们的广泛关注。鉴于微气泡的广泛应用，快速准确的对气泡的大小和尺寸分布的表征也至关重要。本工作对常用的微气泡尺寸表征方法进行了归纳总结，比较了不同的微气泡制备方法的优缺点，并重点阐述了微通道法和膜分散法制备微气泡的研究现状。在此基础上对微分散法制备微气泡的未来研究方向进行展望。

关键词: 微气泡, 气液微分散, 微通道, 气液膜分散, 微气泡表征

Abstract: Microbubbles have been drawn more attentions due to their widely applications. At present, the preparation methods of microbubbles mainly include ultrasonic, electrolytic process, dissolved air flotation and microdispersion. Compared with traditional methods of microbubble generation, the microchannel technology has the advantages of high production efficiency, good controllability, excellent flexibility, which has been applied to produce the monodisperse microbubbles and drops. And the microchannels devices with different structures, such as co-flowing microfluidic, flow focusing, T-microchannel and venturi devices are an all-around introduced in this paper. In the process of gas-liquid membrane dispersion, the microbubbles size is affected by many factors, such as liquid flow velocity, liquid surface tension, liquid viscosity, the pore size, porosity, pore structure of membrane and gas flow velocity. So far, the mechanism of microbubbles formation is complicated, which is still not clear. Moreover, it is also critical important to rapidly and accurately measure the size and distribution of microbubbles due to the wide application of microbubbles. Traditionally, the size and distribution of microbubbles are measured by probes and laser particle analyzer, which is efficient and easy accessibility. However, the insertion of probes will affect the flow filed and the mechanism of lase particle analyzer is not clear. With the rapid development of digital image recognition technology, combination of high-speed camera and digital image recognition technology provides an effective, visual and accurate online microbubbles recognition method to measure microbubbles size. Furthermore, the application of deep learning technology in the recognition of microbubbles has drawn more attentions. In this work, the commonly characterization methods of microbubble size are summarized. In addition, the advantages and disadvantages of different methods of preparation microbubbles are also expounded and the current research status of microchannel method and gas-liquid membrane dispersion method are mainly introduced. On this basis, the future research directions of microbubbles prepared by microdispersion are prospected.

Key words: Microbubbles, Gas-liquid dispersion, Microchannel, Gas-liquid membrane dispersion, Microbubble characterization