Abstract

A comparative study of macro- and micromixing in a 1-L laboratory beaker, a 0.5-L flask, and a microreactor with intensively swirled flows (two-stage jet vortex microreactor (TSJVMR)) is presented. Stirring in the beaker and flask is accomplished with a magnetic stirrer. Mixing is studied with two methods: a 4 M NaOH solution is added to a 0.05 M HCl solution in macromixing studies and the iodide–iodate method is used in micromixing studies. Flows are photographed to establish the mixing behavior in all of the cases and to calculate the mixing zone in the TSJVMR. The results of our studies show that when even macromixing is unsatisfactory with the use of a magnetic stirrer, and the quality of micromixing (as indicated by the segregation index) in the 0.5-L flask equipped with a magnetic follower is 250 times lower than that in the TSJVMR. The results of this study have a significant impact on our understanding of the effects that micromixing conditions have on the solution synthesis of nanoscale particles.

中文翻译：

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宏观和微观混合对具有强烈涡流流动的大型反应器中氧化物颗粒溶液合成过程的影响

摘要

介绍了在 1 升实验室烧杯、0.5 升烧瓶和具有强烈涡流的微反应器（两级喷射涡流微反应器 (TSJVMR)）中进行宏观和微混合的比较研究。用磁力搅拌器完成烧杯和烧瓶中的搅拌。用两种方法研究混合：在宏观混合研究中将 4 M NaOH 溶液添加到 0.05 M HCl 溶液中，在微观混合研究中使用碘化物-碘酸盐方法。对流进行拍照以确定所有情况下的混合行为并计算 TSJVMR 中的混合区。我们的研究结果表明，即使使用磁力搅拌器进行宏观混合也不能令人满意，配备磁力跟随器的 0.5-L 烧瓶中的微量混合质量（如分离指数所示）比该质量低 250 倍在 TSJVMR 中。