微通道内弹状流型下泄漏流的流动、传质、混合及其耦合机理与调控

微通道内气-液/液-液弹状流是强化两相过程的理想流型。该流型下连续相通过气泡/液滴与通道壁面间的缝隙流动而形成的泄漏流是较少被关注的现象。由于泄漏流对“三传一反”过程产生显著的影响，认识和调控泄漏流、掌握其对传质和混合特性的影响对于弹状流的理论发展和实际应用具有十分重要的意义。本课题拟采用高速显微摄像、双光路照明和数值模拟等方法，研究气-液和液-液体系下泄漏流的发生条件和流动特征，通过Navier-Stokes方程和润滑理论分析其驱动内因，进而构建和发展泄漏流理论及其调控手段。结合荧光诱导、在线光谱吸收和数值模拟等方法分别对不同泄漏流条件下两相流动过程中的传质、混合及停留时间分布等特征进行研究，探索泄漏流与传质和混合之间的耦合机理和调控规律，为高效率调控弹状流和反应器设计开发提供理论依据和技术支持。

Gas-liquid/liquid-liquid slug flow in microchannels is an ideal flow pattern for intensification of two-phase processes. In this flow pattern, leakage flow which initiates from the continuous phase bypassing through the space between the gas bubbles/liquid droplets and the channel walls has rarely been paid attention to by researchers. As leakage flow has a significant influence on the transport and reaction phenomena, understanding and regulating it are of great importance to the slug flow theory and application. This project aims at investigating the occuring condition and characteristics of leakage flow using several methods, such as high speed shooting, double-light path lightening, numerical simulation and so on. With the help of Navier-Stokes Equations and lubrication theory, the research allows a deep exploring of the drive force of leakage flow, which then enables a targeted manipulation. As to mass transfer and mixing behavior, this project plans to investigate the mass transfer, local mixing and marco mixing (RTD) characteristics under conditions with different leakage flows using various methods, including aser-induced fluorescence, online spectral absorption and numerical simulation. The results will provide a thorough understanding on the influences of leakage flow on mass transfer and mixing and their coupling mechanism. The upcoming results from this project will also provide a better theoretical basis and technical supporting for the slug flow regulation and reactor design.