Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, International Joint Laboratory on Low Carbon Clean Energy Innovation, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Physics of Fluids Group, Max Planck UT Center for Complex Fluid Dynamics, University of Twente, Enschede 7500 AE, Netherlands.
Philos Trans A Math Phys Eng Sci. 2023 Mar 20;381(2243):20220129. doi: 10.1098/rsta.2022.0129. Epub 2023 Jan 30.
Emulsions are common in many natural and industrial settings. Recently, much attention has been paid to understanding the dynamics of turbulent emulsions. This paper reviews some recent studies of emulsions in turbulent Taylor-Couette flow, mainly focusing on the statistics of the dispersed phase and the global momentum transport of the system. We first study the size distribution and the breakup mechanism of the dispersed droplets for turbulent emulsions with a low volume-fraction (dilute) of the dispersed phase. For systems with a high volume-fraction (dense) of the dispersed phase, we address the detailed response of the global transport (effective viscosity) of the turbulent emulsion and its connection to the droplet statistics. Finally, we will discuss catastrophic phase inversions, which can happen when the volume-fraction of the dispersed phase exceeds a critical value during dynamic emulsification. We end the manuscript with a summary and an outlook including some open questions for future research. This article is part of the theme issue 'Taylor-Couette and related flows on the centennial of Taylor's seminal paper (part 1)'.
乳液在许多自然和工业环境中很常见。最近，人们越来越关注理解湍流乳液的动力学。本文综述了一些关于泰勒-库埃特流中乳液的最新研究，主要集中在分散相的统计和系统的整体动量传递上。我们首先研究了低体积分数（稀）分散相的湍流乳液中分散液滴的尺寸分布和破碎机制。对于高体积分数（密）分散相的体系，我们研究了整体输运（有效粘度）的详细响应以及其与液滴统计的关系。最后，我们将讨论在动态乳化过程中当分散相的体积分数超过临界值时可能发生的灾难性相反转。本文以总结和展望结束，其中包括未来研究的一些开放性问题。本文是主题为“泰勒-库埃特流及相关流（泰勒开创性论文发表一百周年纪念）（第 1 部分）”的一部分。
