外旋流膜器是一种新型微滤装置,采用高精度动态压力测量仪,以清水和5种浓度的SiO2悬浮液为介质流体,选用PA膜管,首次对其中的压力场进行了测试研究,得到了环隙剖面压力沿径、轴向的分布规律,以及操作压力和颗粒浓度对流场压力的影响规律,分析实验结果后提出膜器最大有效长度(Lmax)的概念,并得出实验条件下的最佳操作压力范围。研究结果可用于外旋流膜器结构设计和选择操作参数。The outer-helical-flow microfilter assembly is a new type of equipment for microfiltration. The pressure field in this microfilter with polypropylene tubular membrane,was tested for the first time with high precision dynamic pressure probe instruments, using Si02 in pure water suspensions with varied concentration as flowing medium. The pressure profiles and the impact of operation pressure and particle concentration on flow field pressure were derived.On the basis of data analysis,a conception of "maximum effective length for outside helical assembly"has been put forward and the best operation pressure range under the experimental conditions has been found.The research results can be used in the assembly structure design and choosing operation parameters.国家自然科学基金资助项目(29976025)
