本文選題：平面撞擊流反應(yīng)器　切入點：粘性流體　出處：《華東理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：撞擊流擁有獨特的相間傳遞特性,被廣泛運用于多種單元操作和工業(yè)應(yīng)用中。在撞擊流反應(yīng)器的應(yīng)用中,兩股射流經(jīng)常為不同物性的粘性流體,但目前研究多以水為實驗介質(zhì),因此有必要對不同物性的粘性流體撞擊混合過程進行研究。本文利用粒子圖像測速儀(Particle Image Velocimetry,PIV)、激光誘導(dǎo)熒光技術(shù)(Planar Laser Induced Fluorescence,PLIF)及圖像處理方法對平面撞擊流反應(yīng)器內(nèi)粘性流體流動模式及混合特征進行研究,主要內(nèi)容如下:1.對平面撞擊流反應(yīng)器內(nèi)同種粘性流體的流動模式及混合特征進行了研究,考察了入口射流雷諾數(shù)、流體粘度、反應(yīng)器結(jié)構(gòu)參數(shù)等因素對流動模式和混合效果的影響。實驗結(jié)果表明,相同雷諾數(shù)下,低粘流體混合效果好,流體粘度對流動模式?jīng)]有明顯影響。論文進一步研究了射流間距對平面撞擊流反應(yīng)器內(nèi)半偏轉(zhuǎn)振蕩流型及混合效果的影響,研究發(fā)現(xiàn)射流間距越大,半偏轉(zhuǎn)振蕩出現(xiàn)的雷諾數(shù)越小,相同雷諾數(shù)下反應(yīng)器內(nèi)混合效果改善。2.對T型反應(yīng)器內(nèi)二元粘性流體的流動模式及混合特征進行了研究。利用對應(yīng)的同種流體撞擊混合實驗結(jié)果作為對比,考察了流體物性(粘度、密度)和入口射流雷諾數(shù)對撞擊流流動模式的作用。結(jié)果表明,低雷諾數(shù)(Re≤100)時二元粘性流體的混合效果比同種流體好,這是因為低雷諾數(shù)時由分子擴散主導(dǎo)混合過程,兩射流流股在撞擊面上的濃度差使其分子擴散作用比同種流體強。如以水射流雷諾數(shù)為二元流體雷諾數(shù),二元流體混合體系出現(xiàn)自持振蕩模式的雷諾數(shù)大于單組分流體混合體系。
[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，

本文編號：1608656