环隙式离心萃取器内部两相流动研究进展

环隙式离心萃取器是集成液-液混合与液-液分离于一体的高性能萃取设备，其广泛应用于核工业、化工环保、有色冶金、生物医药等领域。离心萃取器具有优异的水力学特性和传质特性，这主要得益于其环隙中的泰勒涡流以及转鼓内的离心分离流等特殊流动。本文主要依据离心萃取器结构和两相流动特点，综述了环隙内气-液界面变化规律、气泡流动特性、液-液两相流型、液滴流动特性，以及转鼓内的气-液界面等方面的研究进展，还总结了环隙螺旋隔板、转鼓径向叶片等结构的优化对于两相流动、混合或分离效果的影响。在后续研究中，可以从离心萃取过程中的液滴分散和聚并机理、三相流动测试及模拟、结构的模型化设计方法等方面开展更加深入的研究。

Advancement in two-phase flow of annular centrifugal extractor

The annular centrifugal extractor(ACE) is a high-performance extraction equipment that integrates liquid-liquid mixing and liquid-liquid separation. It is widely used in nuclear industry, chemical environmental protection, non-ferrous metallurgy, biomedicine and other fields. The excellent hydraulics and mass transfer characteristics of the ACE are due to its internal flow characteristics, including Taylor vortex flow in the annulus region and centrifugal flow in the rotor. According to the structure and flow characteristics in the annular centrifugal extractor, the advances in the gas-liquid interface, bubble flow, liquid-liquid flow pattern and droplet flow in the annular, as well as the gas-liquid interface in the rotor were summarized, respectively. Also, the influences of structure optimization, such as helical baffles of annular, curved radial vane of rotor etc., on flow characteristics, mixing or separation performance were summarized. In the future, the mechanism of dispersion and coalescence of droplets in the process of centrifugal extraction, the three-phase flow test and simulation, and the design method of modeling would be the emphasis of ACE research.