分离再结合型与内交叉指型微混合器微观混合性能实验研究

利用碘化物-碘酸盐平行竞争反应体系对分离再结合型和内交叉指型微混合器的微观混合性能进行了研究.实验考察了氢离子浓度、雷诺数和混合流体的体积流量比对微混合器离集指数的影响,并对实验结果进行了理论分析.研究结果表明,对所研究的两种微混合器,混合流体的体积流量比为1时,适宜的氢离子浓度范围均为0.02~0.04mol/L,微观混合效果最好.随着体积流量比的增加,离集指数增加,表明微观混合性能变差.雷诺数增大有利于微观混合效率的提高.在所研究的雷诺数范围内,相同雷诺数时分离再结合型微混合器的微观混合效果略好于内交叉指型微混合器.

Experimental study of micro-mixing performance of split and recombine micromixer and interdigital micromixer

The iodide-iodate parallel competing reaction system is used to investigate the micro-mixing performance of two micromixers:a split and recombine micromixer and an interdigital micromixer. The effects of H + concentration, Re and volume flow ratio of mixing streams on the segregation index in the micromixers are experimentally studied, and the experimental results are analyzed theoretically. The results indicate that, for both micromixers, the proper H + concentration range is 0.02-0.04 mol/L to obtain the best micro-mixing performance when the volume flow ratio of mixing streams is 1. It is found that the segregation index increases with the volume flow ratio, which suggests that the micro-mixing performance is lowered. The increase of Re is beneficial to improve the efficiency of micro-mixing. The micro-mixing performance of the split and recombine micromixer is better than that of the interdigital micromixer at the same Re for the studied range of Re .