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空气隙膜蒸馏系统热容腔内料液的流动状态直接影响到温度和浓度边界层效应,决定系统的膜通量。本文采用三根沿圆周平均分布的入流管,喷管是鸭嘴形,应用PIV系统测试膜面附近流动状态。在5种喷管中心线与热容腔径向夹角β和3种喷管前端和膜面间距离δ下,测试得到膜面附近的速度场数据,并计算得到涡量场信息。结果表明,所研究的膜组件结构参数β和δ对热容腔内料液的流动状态影响很大,适当的热容腔结构参数可以有效地改善温度极化边界层和浓度极化边界层的影响,增大膜通量。研究结果为空气隙膜蒸馏系统热容腔入流装置的优化设计提供了实验数据和研究经验。
The flow of feed solution in the heat chamber of the air gap membrane distillation system directly affects the temperature and concentration boundary layer effects and determines the membrane flux of the system. In this paper, three evenly distributed inflow tubes along the circumference are used. The nozzle is a duckbill. The PIV system is used to test the flow state near the membrane surface. The velocity field data near the membrane surface was obtained by measuring the radial angle β between the center of the five nozzles and the radial direction of the heat capacity cavity and the distance between the front of the three kinds of nozzles and the distance between the membrane surfaces. The vorticity field information was calculated. The results show that the structural parameters β and δ of the membrane module have a great influence on the fluid flow in the heat capacity cavity. Appropriate parameters of the heat capacitance can effectively improve the temperature polarization boundary layer and the concentration polarization boundary layer Influence, increase membrane flux. The research results provide experimental data and research experience for the optimal design of the inflow device of the air gap membrane distillation system.