Abstract:

The mechanisms and models of bubble breakup in a fully developed turbulent flow are reviewed. The breakup mechanisms are classified into four categories: turbulent eddy collision, viscous shear stress, vortex shear shedding-off, and interfacial instability. The reported models for predicting the bubble breakup rate and daughter bubble size distribution are systematically summarized. The development and limitations of the existing bubble breakup models are analyzed and discussed, and the future direction of model development and improvement are proposed. Experimental studies of breakup of single bubbles in turbulent flow are summarized. According to the methods of producing turbulence, the experiments are divided into four types: turbulence generated by increasing liquid velocity, turbulence generated by internals, turbulence generated by stirring, and turbulence generated by conical reactor and stirring. The development and limitations of existing bubble breakup experiments are discussed. Finally, the bubble breakup rates predicted by the models are compared with experimental data, showing that several bubble breakup models in the literature have good prediction ability.

Key words: turbulence, bubble breakup model, daughter bubble size distribution, single bubble breakup experiment

摘要：

综述了充分发展湍流中气泡破碎的机理和模型，将其机理归纳为湍流涡碰撞、黏性剪切、尾涡剪切脱落过程和界面不稳定性四类。对文献中气泡破碎速率和子气泡大小分布的预测模型进行了系统总结。分析讨论了现有气泡破碎模型的发展和局限性，并提出了未来的发展方向。同时，也综述了湍流中单气泡破碎的实验研究，依据产生湍流的方法归纳为四种情况：增大液体流速产生湍流，采用内构件产生湍流，搅拌产生湍流，以及圆锥反应器结合搅拌产生湍流。总结了现有气泡破碎实验的进展和局限，并进行了分析和展望。最后，通过将文献中气泡破碎速率模型预测值和实验数据进行对比，表明文献中多个破碎模型已经有了较好的预测能力。

关键词: 湍流, 气泡破碎模型, 子气泡大小分布, 单气泡破碎实验