The efficient preparation of microbubbles is very meaningful due to the wide applications of microbubbles in water treatment, food industry, cosmetics, and pharmaceuticals industry. In this work, a flow system based on commercial porous ceramic membrane is developed for controllable generation and rapid characterization of microbubbles. The images of generated microbubbles in the visualization cell are captured by a CCD on the microscope, and the size and distribution of microbubbles can be rapidly obtained with MATLAB. The influences of liquid flow velocity, liquid viscosity, surface tension, membrane pore size and gas superficial velocity on the microbubble size are systematically studied. To increase the liquid flow velocity and corresponding liquid shear stress, a stainless-steel rod is inserted into the middle of ceramic membrane, which can effectively decrease the bubble size. Under the optimal experimental conditions, the microbubbles with the diameter of 64˜87 μm are continuously prepared. A mathematical model is developed which can predict the microbubbles size under different conditions, which is useful for the understanding and design of microbubble generation.

由于微泡在水处理，食品工业，化妆品和制药工业中的广泛应用，有效制备微泡非常有意义。在这项工作中，开发了一种基于商用多孔陶瓷膜的流动系统，以控制微气泡的产生和快速表征。可视化单元中生成的微泡的图像由显微镜上的CCD捕获，并且微泡的大小和分布可以使用MATLAB快速获得。系统地研究了液体流速，液体粘度，表面张力，膜孔径和气体表观速度对微气泡尺寸的影响。为了提高液体流速和相应的液体剪切应力，将一根不锈钢棒插入陶瓷膜的中间，可以有效减小气泡大小。在最佳实验条件下，连续制备直径为64〜87μm的微泡。建立了可以预测不同条件下微泡尺寸的数学模型，这对于理解和设计微泡产生很有用。