平行阵列微细通道流量分配特性

Flow distribution characteristic of parallel array microchannel

本文以去离子水为流动工质,实验测试了集管尺寸、不同入口流量、不同倾斜角度以及支管插入深度等参数对平行阵列微细通道内流量分配的影响,为便于观测流动形态,实验段采用透明有机玻璃制成。结果表明,随着集管直径的增加,各分支管内流量分配均匀性η值波动减小,流量分配均匀性增加;随着入口流量增大,各支管流量分配均匀度η波动则逐渐降低,各平行支管流量分配相对较均匀,且整体均匀度S随入口流量增加而减小;倾斜角度对流量分配均匀性影响较大,当倾角为60°时各平行分支管流量分配较为均匀;当分支管插入深度为5mm时,流量分配均匀度η波动相对较小,无插入深度时η值波动相对较大,故支管有一定插入深度时可改善各支管的流量分配效果。

In this paper,the deionized water was used as working medium and the experiment was conducted to research the influence of head tube size,different inlet flow rates,different inclination angles and insertion depth of branch pipes on the flow distribution in the parallel array micro -ehannels.The experimental section was made of transparent organic glass in order to eon- venient observe the flow patterns.The results show that,with the increase of the diameter of the head tube,the fluctuation of flow distribution uniformity η value decreases and the flow distribution uniformity increases.As the inlet flow rates increasing,the flow distribution uniformity η fluctuation of each branch decreases gradually.The flow distribution of each parallel branch is relatively uniform,and the overall uniformity S decreases with increase of inlet flow.The inclination angle has a greater influence on the u- niformity of flow distribution.When the inclination angle is 60°,the flow distribution of parallel branches is uniform;when the insertion depth of the branch pipe is 5mm,the flow distribution uniformity η fluctuates relatively small.When there is no inser- tion depth,the η value fluctuates relatively large.Therefore,when the branch pipe has a certain insertion depth,the flow distri- bution effect of each braneh pipe can be improved.