A platform based on gas–liquid membrane dispersion with helical internals inserted is developed for microbubble generation. The effects of internals on microbubble size are investigated, including circular, helical, twisted, and polygonal geometries. Parametric studies are conducted by varying the liquid flow velocity, liquid physical properties, geometric shape, helical pitch and thickness. Compared with membranes developed with other internals inserted, the membrane with helical internals has the highest performance for microbubble generation. The size of microbubbles decreases with increasing helical pitch and decreasing helical thickness in different liquid phases. CFD simulation is used to reveal the flow field with internals inserted into the membrane, which indicates that Dean vortices are effectively generated by inserting helical internals. An empirical correlation describing the microbubble size in the metallic membrane is developed considering the contribution of the gas–liquid ratio, capillary force and Dean vortices, showing good agreement with experimental data.

开发了一种基于气液膜分散体并插入螺旋内件的平台，用于产生微气泡。研究了内部结构对微气泡尺寸的影响，包括圆形、螺旋形、扭曲形和多边形几何形状。通过改变液体流速、液体物理特性、几何形状、螺距和厚度来进行参数研究。与插入其他内件开发的膜相比，具有螺旋内件的膜具有最高的微气泡生成性能。在不同液相中，微泡的尺寸随着螺距的增加和螺旋厚度的减小而减小。CFD 模拟用于揭示插入膜的内部构件的流场，这表明通过插入螺旋内件有效地产生了迪恩涡流。考虑到气液比、毛细管力和迪恩涡旋的贡献，建立了描述金属膜中微气泡大小的经验相关性，与实验数据显示出良好的一致性。