T型反应器内流动、混合及界面反应特征

doi:10.11949/0438-1157.20210386

摘要/Abstract

摘要：

利用平面激光诱导荧光（PLIF）技术和酚酞显色反应，对不同Reynolds数（20<Re<420）下T型反应器内的复杂流动结构及界面反应进行了可视化研究。随着入口Re的增加，反应器内依次出现分离流、稳态吞噬流、非稳态吞噬流及非稳态对称流等流动模式。重点考察了不同流动模式下T型反应器内的界面反应特征，结合流动模式对混合效果、产物浓度分布及时间演化进行了分析，揭示了反应器内复杂流场对混合及界面反应的影响机理。结果表明，吞噬流三维旋涡结构使流体相互卷吸缠绕，通过折叠拉伸形成层状的流体界面，极大增加了反应物的界面接触面积，混合及反应程度显著提升，产物浓度较高且分布均匀。

关键词: T型反应器, 平面激光诱导荧光, 流动, 混合, 界面反应

Abstract:

The complex flow structure and interface reaction in the T-jet reactor under different Reynolds numbers (20<Re<420) were visualized by using planar laser induced fluorescence (PLIF) technology and phenolphthalein color reaction. With the increase of Re at inlet, separation flow, steady engulfment flow, unsteady engulfment flow and unsteady symmetric flow displayed successively in the reactor. In particularly, characteristics of the interfacial reaction in T-jet reactor at different flow modes were investigated. The mixing effect, product concentration distribution and time evolution were analyzed combined with the flow field structure. The influence of complex flow field on mixing and interfacial reaction was revealed. The results showed that the three-dimensional vortex structure of engulfment flow makes the fluid entrains with each other, and the layered fluid interface is formed by folding and stretching, which greatly increases the interface contact area of reactants, and improves the mixing and reaction degree significantly. And the product concentration is high and distributed uniformly.

Key words: T-jet reactor, planar laser induced fluorescence, flow, mixing, interfacial reaction

中图分类号:

TQ 021.1

张航,张巍,李伟锋,刘海峰,王辅臣. T型反应器内流动、混合及界面反应特征[J]. 化工学报, 2021, 72(10): 5064-5073.

Hang ZHANG,Wei ZHANG,Weifeng LI,Haifeng LIU,Fuchen WANG. Characteristics of flow, mixing and interfacial reaction in T-jet reactor[J]. CIESC Journal, 2021, 72(10): 5064-5073.

图/表 10

图1 实验流程示意图

Fig.1 Schematic diagram of experiment flow

图2 T型反应器结构示意图

Fig.2 Structural diagram of T-jet reactor

图3 Re=20、80、120、160时的PLIF图像及显色反应图像

Fig.3 PLIF images and color reaction images at Re=20, 80, 120 and160

图4 Re=20、80、120、160时PLIF图像中z/h=10截面中心线上的染色剂浓度分布

Fig. 4 Distribution of dye concentration on central line of section z/h=10 in PLIF images at Re=20, 80, 120 and 160

图5 Re=20、80、120、160时归一化处理后的反应产物浓度图像及不同出口位置的浓度分布

Fig.5 Images of normalized product concentration and distribution on different outlet sections at Re=20, 80, 120 and 160

图6 Re=240时非稳态吞噬流一个振荡周期内的PLIF图像及显色反应图像

Fig. 6 PLIF images and color reaction images in one oscillation period at Re=240

图7 Re=240时非稳态吞噬流的图片相关系数时间序列以及快速傅里叶变换（FTT）频谱分析结果

Fig.7 The time series of image correlation coefficient and FTT power frequency spectrums at Re=240

图8 非稳态吞噬流模式St与Re之间的关系

Fig. 8 Strouhal number in unsteady engulfment flow with Reynolds number

图9 Re=420时非稳态对称流模式的PLIF图像及反应图像

Fig.9 Images of PLIF and reaction in unsteady symmetric flow at Re=420

图10 不同出口截面上的反应产物离析度IS及相对浓度随Re变化情况

Fig.10 Intensity of segregation and relative concentration with Re on different outlet sections

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