Flow characteristics and micromixing performance of micro-CSTR with magnetic stirring
钟子豪 1刘塞尔 1商敏静 1苏远海1
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作者信息
1. 上海交通大学化学化工学院,薄膜与微细技术教育部重点实验室,上海 200240
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摘要
微型连续搅拌反应器(CSTR)作为一种新型主动式强化微反应器,具有较强的处理涉固反应体系的能力.构建了一套基于磁力搅拌、总体积为3 ml 且由16个微圆槽串联而成的微型CSTR,通过停留时间分布测量和Villermaux-Dushman快速平行竞争反应实验对其流动特征以及微观混合性能进行探究.研究结果显示,对于该微型CSTR,流速和转速对其返混程度只有较小的影响,Peclet数(Pe)整体维持在20～30之间,返混程度略高于传统管式微反应器,但仍属较低.微型CSTR微观混合效率优于管式微反应器,尤其是在低流速时,其混合效率远高于管式微反应器.进一步通过团聚模型计算获得该微型CSTR的特征混合时间,其值处于0.5～1.0 ms之间.
Abstract
As a new type of actively enhanced microreactor,micro continuous stirred reactor(micro-CSTR),has a strong ability to handle solid-related reaction systems.In this paper,a micro-CSTR based on magnetic stirring with a total volume of 3 ml and consisting of 16 micro cylindrical grooves was constructed.Its flow characteristics and micromixing performance were investigated by residence time distribution measurement and Villermaux-Dushman fast parallel competitive reaction experiments.The results demonstrated that the flow rate and rotational speed exerted weak influence on the degree of backmixing in the micro-CSTR.The overall Peclet number(Pe)was maintained between 20 and 30,indicating that the degree of backmixing was slightly higher than that of tubular microreactors frequently applied.However,the degree of backmixing remained relatively low.The micromixing efficiency of the micro-CSTR was superior to that of the tubular microreactor,particularly at low flow rates.The characteristic mixing time of this micro-CSTR was further determined using the incorporation model,with a value falling within the range of 0.5 ms to 1.0 ms.
关键词
微反应器/混合/停留时间分布/微型CSTR/微观混合
Key words
microreactor/mixing/residence time distribution/micro-CSTR/micromixing
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