气液两相流在平行微通道内的相分配特性

气液两相流的流量分布不均以及气液相的偏流现象是平行流微通道器件应用所面临的两个关键问题，它们的研究对微通道系统的设计与利用具有重要的理论意义和应用价值。本项目拟将针对气液两相流在平行微通道的偏流特性，进行以下几个方面的研究：（1）不同入口流型条件下气液两相流在平行流通道中的可视化观察与相分配特性研究；（2）设计并探索不同几何结构（包括封头形状、支管数目和支管间距等因素）对相分配特性的影响；（3）考察微小尺度内流体物性(表面张力、黏性、润湿性)对相分配特性的影响。通过以上实验与理论研究相结合的方法，探明影响气液两相流在平行微通道的相分配的关键因素，建立气液两相在各支管分配的理论预测模型，为微型反应器、微型换热器的开发和应用提供理论指导与基础支撑。

Uneven distribution and phase separation of gas-liquid two-phase flow are the two key issues restricting the applications of parallel microchannel devices.The study of two-phase distribution in parallel microchannels has important theoretical and practical values for the design and application of microchannel system. Aim at the phase separation of gas-liquid two-phase flow in parallel microchannels,the project intends to study the main scientific issues listed as follows: (1)the visual observation and phase distribution characteristics of two-phase flow in parallel microchannels under different inlet flow patterns; (2) to design different geometrical conditions,including different shapes of the head, the number and the pitch of the channels, and to clarify their effect on the phase distribution; (3) to study the effect of fluid properties, such as surface tension, vescosity, and wettability on the phase distribution of two-phase flow in microscale. Through combining theoretical and experimental research methods, we will clarify the key factors affecting the gas-liquid two-phase distribution in parallel microchannels,and establish the theoretical models to predict two-phase distribution in parallel microchannels, to provide the theoretical guidance for the development and application of micro reactors and micro heat exchangers.