空气隙膜蒸馏系统中超声应用研究  

An application of ultrasonic irradiation in an air gap membrane distillation system

作　　者：刘光良[1] 朱之墀[1] 黄东涛[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《声学学报》2000年第2期108-114,共7页Acta Acustica

基　　金：国家教育委员会博士点基金

摘　　要：首次将超声激励技术用于膜蒸馏系统以提高蒸馏通量，并采用连续和间隙性超声激励研究超声参数对传质传热的影响并探讨其影响机理．结果表明。（１）蒸馏通量随着超声功率的增大而增加；本实验的超声激励可使蒸馏通量提高３０％；连续激励比间隙激励效果好．（２）超声空化、声学流和膜面振动改善了温度和浓度极化并清洗了膜面，这是超声激励提高蒸馏通量的主要机理，其中声学流与空化对温度和浓度极化的改善更为重要．本文还证实了文献１０提出的关于膜蒸馏通量的理论计算公式也适用于有超声激励的情况．Ultrasonic irradiation technique was firstly applied to a membrane distillation system to increase the distillation rate in the paper. The effect of ultrasonic parameters on the mass and heat transfer, and the ultrasonic mechanismwas studied by use of continuous and intermittent ultrasonic irradiation. The results indicate that the distillation rateincreases with the increase of ultrasonic power and the 30% of the distillation rate can be increased in the experiments.Moreover the effect of the continuous irradiation is better than the intermittent one. As for ultrasonic mechanism it isshown that ultrasonic cavitation, acoustic streaming and membrane vibration improve the temperature-concentrationpolarization and clean the membrane surface, resulting in the increase of distillation rate. Here the acoustic streamingand cavitation, which improve the temperature-concentration polarization 3 are more important mechanism. Finallythe theoretical formula for calculation of distillation rate in reference 10 was proved also valid in the case of ultrasonicirradiation in the paper.

关 键 词：空气隙膜蒸馏系统 超声激励 膜分离 

分 类 号：TB43[一般工业技术]