团队博士刘亦琳关于湿空气在纤维膜束间的流动特性及传质性能的研究成果“Flow behavior and mass transfer of humid air across fiber membrane bundles”发表于传热学最具期刊Applied Thermal Engineering。

Dr. Liu Yilin published a paper titled “Flow behavior and mass transfer of humid air across fiber membrane bundles” about the flow behavior and dehumidification performance of membrane module in Applied Thermal Engineering, which is a famous journal in the field of heat and mass transfer.

中空纤维膜组件是压力驱动错流膜除湿系统的重要部件，为了最大限度地发挥膜除湿系统的优势，探究膜组件结构参数对纤维束间的传质和流动特性的影响具有重要意义。本研究建立了错排和顺排形式的中空纤维膜组模型，以研究湿空气在纤维膜束间的流动及传质特性。纤维束间流场的研究表明，两种结构中的膜外壁附近的速度线密度较大，而错排结构的纤维束间则存在流体滞止区。综合分析两种结构内的流场和浓度场，顺排膜组件在除湿性能和能效方面更有优势。膜组件结构参数的研究结果表明，管间距的增加对除湿率有负面影响。而增加支撑层厚度，缩小纤维半径，有利于膜组件除湿性能的提高。本文的研究结果为膜组件构的优化提供了有价值的理论指导。

Hollow fiber module is an important component of the pressure-driven cross-flow membrane dehumidification system. In order to maximize the advantages of membrane dehumidification system, it is of great significance to explore the influence of module structural parameters on the flow characteristics and mass transfer between fiber bundles. In the present work, staggered and inline arranged membrane components are modeled to numerically investigate the flow behavior and mass transfer of humid air across the fiber membrane bundles. The study of flow behavior showed that the velocity contours are denser near the membrane outer wall for both configurations, while a fluid stagnation zone is observed in the staggered arrangement. Through the analysis of the flow and concentration fields in the two configurations, it was found that for the fiber membranes with small radius, the inline arrangement possesses more advantages in terms of dehumidification capacity and energy efficiency. The results indicated that the increase of tube pitch has a negative effect on the dehumidification rate. In addition, thickening the thickness of the membrane support layer and decreasing the fiber radius are conducive to the dehumidification performance. The outcomes may provide the valuable theoretical guidance for optimizing membrane module structure.

文章链接：http://doi.org/10.1016/j.applthermaleng.2022.118200