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Flow Behaviour Analysis and Experimental Investigation for Emitter Micro-channels

Chinese Journal of Mechanical Engineering 2012年第4期25卷 729-737页

作者： wei zhengying cao meng liu xia tang yiping lu bingheng State Key Lab for Manufacturing System Engineering Xi 'an Jiaotong University Xi 'an 710049 China

The existing research of the flow behavior in emitter micro-channels mainly focuses on the single-phase flow *** the recent micro-particle image velocimetry（PIV） experimental research on the flow characteristics in various micro-channels mainly focuses on the single-phase fluid ***,using an original-size emitter prototype to perform the experiments on the two-phase flow characteristics of the labyrinth channels is seldom *** this paper,the practical flow of water,mixed with sand escaped from filtering,in the labyrinth channel,is *** some research work on the clogging mechanism of the labyrinth channel＇s structure is *** fluid dynamics（CFD） analysis has been performed on liquid-solid two-phase flow in labyrinth-channel *** on flow visualization technology-micro-PIV,the flow in labyrinth channel has been photographed and *** path line graph and velocity vector graph are obtained through the post-treatment of experimental *** graphs agree well with CFD analysis results,so CFD analysis can be used in optimal design of labyrinth-channel *** the optimized anti-clogging structures of the rectangular channel and zigzag channel have been designed *** CFD numerical simulation and the micro-PIV experiments analysis on labyrinth-channel emitter,make the ＂black box＂ of the flow behavior in the emitter channel ***,the proposed research promotes an advanced method to evaluate the emitter＇s performance and can be used to conducting the optimal design of the labyrinth-channel emitters.

关键词： drip irrigation emitter labyrinth channel two-phase flow analysis anti-clogging micro-PIV

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