A review of bubble break-up

The coalescence and break-up of bubbles are important steps in many industrial processes. To date, most of the literature has been focussed on the coalescence process which has been studied using high speed cinematographic techniques. However, bubble break-up is equally important and requires further research. This review essentially details the break-up process and initially summarizes the different types of bubble deformation processes which lead to break-up. Break-up is considered in high and low turbulent (pseudo-static) conditions and the effect of fluctuations and shear forces on the break-up is reviewed. Different mechanisms of break-up are discussed including shearing-off, coalescence induced pitching and impact pinching following air entrapment. Also, the influence of bubble size, interfacial stability, and surfactant on break-up are reviewed and a summary of recent experimental techniques presented. Finally, the break-up process which occurs in micro-fluidics is summarized. (C) 2019 Elsevier B.V. All rights reserved.

气泡的聚并和破裂在许多工业过程中是重要步骤。到目前为止，大多数文献都集中在聚并过程上，该过程已使用高速摄影技术进行了研究。然而，气泡破裂同样重要，需要进一步研究。这篇综述主要详细介绍了破裂过程，并首先总结了导致破裂的不同类型的气泡变形过程。在高湍流和低湍流（准静态）条件下考虑了破裂情况，并综述了波动和剪切力对破裂的影响。讨论了不同的破裂机制，包括剪切分离、聚并诱导的倾斜以及空气夹带后的冲击挤压。此外，还综述了气泡大小、界面稳定性和表面活性剂对破裂的影响，并介绍了近期的实验技术总结。最后，总结了微流体中发生的破裂过程。（C）2019爱思唯尔公司。保留所有权利。