平面撞击流反应器粘性流体混合过程研究

发布时间：2018-03-13 23:38

  本文选题：平面撞击流反应器　切入点：粘性流体　出处：《华东理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：撞击流拥有独特的相间传递特性,被广泛运用于多种单元操作和工业应用中。在撞击流反应器的应用中,两股射流经常为不同物性的粘性流体,但目前研究多以水为实验介质,因此有必要对不同物性的粘性流体撞击混合过程进行研究。本文利用粒子图像测速仪(Particle Image Velocimetry,PIV)、激光诱导荧光技术(Planar Laser Induced Fluorescence,PLIF)及图像处理方法对平面撞击流反应器内粘性流体流动模式及混合特征进行研究,主要内容如下:1.对平面撞击流反应器内同种粘性流体的流动模式及混合特征进行了研究,考察了入口射流雷诺数、流体粘度、反应器结构参数等因素对流动模式和混合效果的影响。实验结果表明,相同雷诺数下,低粘流体混合效果好,流体粘度对流动模式没有明显影响。论文进一步研究了射流间距对平面撞击流反应器内半偏转振荡流型及混合效果的影响,研究发现射流间距越大,半偏转振荡出现的雷诺数越小,相同雷诺数下反应器内混合效果改善。2.对T型反应器内二元粘性流体的流动模式及混合特征进行了研究。利用对应的同种流体撞击混合实验结果作为对比,考察了流体物性(粘度、密度)和入口射流雷诺数对撞击流流动模式的作用。结果表明,低雷诺数(Re≤100)时二元粘性流体的混合效果比同种流体好,这是因为低雷诺数时由分子扩散主导混合过程,两射流流股在撞击面上的浓度差使其分子扩散作用比同种流体强。如以水射流雷诺数为二元流体雷诺数,二元流体混合体系出现自持振荡模式的雷诺数大于单组分流体混合体系。
[Abstract]:Impinging flow is widely used in many kinds of unit operation and industrial application because of its unique interphase transfer characteristics. In the application of impinging flow reactor, two jets are often viscous fluid with different physical properties, but water is widely used as experimental medium. Therefore, it is necessary to study the mixing process of viscous fluid impingement with different physical properties. In this paper, particle Image velocimetry technique, laser induced fluorescence technique, Planar Laser Induced fluorescence technique and image processing method are used to study the viscidity of plane impinging flow reactor. Fluid flow patterns and mixing characteristics, The main contents are as follows: 1. The flow model and mixing characteristics of the same viscous fluid in the plane impinging flow reactor are studied, and the Reynolds number of the inlet jet and the viscosity of the fluid are investigated. The experimental results show that the mixing effect of low viscosity fluid is good at the same Reynolds number. The effect of jet spacing on half-deflection oscillating flow pattern and mixing effect in plane impinging flow reactor is further studied, and it is found that the larger the jet spacing is, the greater the flow pattern is. The smaller the Reynolds number of semi-deflection oscillations, At the same Reynolds number, the mixing effect in the reactor is improved. 2. The flow model and mixing characteristics of binary viscous fluid in T reactor are studied. The effects of fluid physical properties (viscosity, density) and inlet jet Reynolds number on impinging flow model are investigated. The results show that the mixing effect of binary viscous fluid is better than that of the same fluid at low Reynolds number (re 鈮，

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