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 paper provides experimental data and research experience for optimization design of air gap membrane distillation hot-cavity.Liquid flow state in air gap membrane distillation hot-cavity affects membrane flux greatly because flow changes temperature boundary layer and concentration boundary layer.The designed angle between three inlets was 120 degree and inlet＇s nozzle was like a duck＇s mouth.The flow field was measured and calculated the average velocity and average vorticity near the membrane wall at 5 groupsβdata and 3 groups S data by PIV.The results show that structure parametersβandδaffect liquid flow state greatly in air gap membrane distillation hot-cavity and the appropriate cavity parameters can increase the membrane flux effectively.
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