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Research progress of continuous generation of microbubbles by microdispersion
- Bingqi XIE Caijin ZHOU Xiaoting HUANG Xiangdong MA Jisong ZHANG
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The Chinese Journal of Process Engineering. 2021, 21(8):
865-876.
DOI: 10.12034/j.issn.1009-606X.220341
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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.