一种新型流管反应器的设计与表征

A flow tube reactor for the study of aerosol formation mechanisms:design and characterization

介绍了一种用于气溶胶生成机制研究的流管反应器(Jiao-FTR,J-FTR)的设计及表征.借助计算流体力学(CFD)模拟和实验测定,表征了不同进气结构和实验条件下反应器内流场的发展及稳定,移动进气管的喷射效应以及气体和颗粒物在反应器内的平均停留时间.结果表明,预混合段进气方式,主流流量,移动进气管结构及注入流量对J-FTR的流场发展以及气体和颗粒物的停留时间具有较大影响;J-FTR的预混合进气段具有使主流快速过渡为层流的优势,在对称进气条件下,当主流流量不超过8L/min,气流在进入主反应段之前可发展为稳定的层流;当移动进气管使用大内径的直管或径面十字型结构时,可以有效减小或避免移动进气管的喷射效应.以上结果不仅可为使用J-FTR开展大气化学和气溶胶生成机制研究提供重要的实验指导,也可为其他研究者设计FTR,进行流管实验提供借鉴.

This paper introduces the design and characterization of a flow tube reactor(Jiao-FTR,termed as J-FTR)for the study of aerosol formation mechanism.The flow field,the injection effect of the movable inlet,as well as the average residence time of gases and particles in the J-FTR under different configurations and operating conditions were characterized using a combination of computational fluid dynamics(CFD)simulations and direct measurements.The results show that the way of flow addition in the premixing section,the main flow rate,and the movable inlet geometry significantly affect the flow field and the residence time of gases and particles in the J-FTR.The premixing section aids in the development of a laminar main flow in the reactor.When the main flow was smaller than 8L/min,the flow became laminar before it entered the main reaction section of the reactor.When the movable inlet employed a straight tube with a relatively larger inner diameter or a cross-tube,its injection effects can be largely reduced or avoided.These results not only provide important guidance for performing J-FTR experiments of VOCs oxidation and aerosol formation,but also provide reference for other researchers to design FTR and carry out flow tube experiment.