Investigation of the influence of transport processes on chemical reactions in bubble flows using space-resolved in-situ analytics and simultaneous characterization of bubble dynamics in real-time

使用空间分辨原位分析和实时气泡动力学同步表征来研究传输过程对气泡流中化学反应的影响

• 批准号: 256771036
• 负责人: Professor Dr.-Ing. Sven Simon
• 金额: --
• 依托单位: Institut für Technische Informatik (ITI)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/256771036?language=en
• 关键词: Investigation; influence; transport; processes; chemical

By developing new experimental techniques, important contributions to an improved understanding of the interaction between hydrodynamics and chemical reactions in bubble flows shall be achieved. In this (particular) case the experimental methods are based on a novel Real-Time Raman-Process-Analysis-System that allows for a spatially and temporally-resolved in-situ analysis of the liquid phase in the vicinity of the simultaneously observed bubble. This system is an extension of the Real-Time-Process-Analysis-System, which was implemented by the applicant Professor Simon in another DFG-Priority-Program, and the in-situ Raman spectrometer established by Dr. Rinke, which shall be further developed here and integrated with the Real-Time-Process-Analysis-System.With this System the kinetics of chemical reactions in relation to the bubble dynamics will be investigated in detail. In correlation with the observation of bubbles and bubble shapes, the spatially-resolved analysis yields the relevant information about the substance input. In this regard, an extensive automated analysis of bubble shapes will be conducted to measure a large number of bubbles and thereby obtain statistically meaningful results. In this project, bubbly flows, bubbles immobilized by counter-flow with and without the influence of turbulence (grid installations) as well as Taylor-flows within microchannels are to be investigated.In order to determine the chemical composition, the Real-Time-Process-Analysis-System will be used to determine the local substance concentration for each laser pulse at one or more measurement points within a bubble flow at a defined point in time. To achieve this task, a complete Raman spectrum is to be recorded so that chemical reactions with complex Raman spectra can be evaluated and the Real-Time-Raman-Process-Analysis-System is used and applied in a flexible and universal way. Simultaneously with the recording of the Raman spectra, the rising bubbles, bubbles swarms and the surrounding flow field are monitored with high frame rates such as 1000 frames/s, to monitor/track the trajectory and dynamics of the observed rising bubble, e.g., to determine the measurement point or the measurement points for the Raman spectroscopy with respect to the position of the bubble in real-time. This is done by the Real-Time-Raman-Process-Analysis-System by determining the position of the observed bubble of each image sequence in real-time using an integrated image analysis mechanism.With respect to the experimental arrangement, the optical axis of the Real-Time-Raman-Process-Analysis-System is perpendicular to the flow direction of the bubbles in the bubble channel, so that the system can be integrated laterally in the test array and a 2D top view of the bubbles can be recorded and analyzed in real-time.

通过开发新的实验技术，应对气泡流中水动力学和化学反应之间的相互作用的了解的重要贡献。在这种（特殊）的情况下，实验方法基于一种新型的实时拉曼过程 - 过程 - 分析系统，该系统允许在同时观察到的气泡附近的液相进行空间和时间分辨的原位分析。该系统是实时过程 - 分析系统的扩展，由申请人西蒙教授在另一项DFG-Priority程序中实施，以及Rinke博士建立的原位拉曼光谱仪，该系统应在此处进一步开发，并与该系统进行了与kinet ceptions的动态有关，该系统在相关的范围内与实时配置系统进行了整合。与气泡和气泡形状的观察相关，空间分辨分析得出有关物质输入的相关信息。在这方面，将对气泡形状进行广泛的自动分析，以测量大量气泡，从而获得统计意义的结果。在这个项目中，应研究有或没有湍流影响（网格装置）以及微通道内的泰勒 - 河流的气泡，并在微电通道中进行的气泡固定。为了实现这项任务，要记录一个完整的拉曼光谱，以便可以评估具有复杂拉曼光谱的化学反应，并以灵活且通用的方式使用和应用实时 - 拉曼过程 - 过程 - 过程 - 分析系统。同时，随着拉曼光谱的记录，用高框架速率（例如1000帧/s）监控了起伏的气泡，气泡和周围的流动场，以监视/跟踪观察到的升高气泡的轨迹和动态，例如，以确定Raman Expercoppoy的测量点或测量点或测量值，以实现Raman SpectRoscopy的位置，以实现该位置。这是通过实时摩擦程序 - 分析系统通过使用集成的图像分析机制来确定每个图像序列在实时中观察到的气泡的位置来完成的。与实验排列相关，实时 - 实时 - 摩擦过程的光轴，实时的 - 摩擦过程的光轴，始终是始终的一定态度，始终是该系统的流量，因此可以验证该系统的流量，因此，同样是该系统，因此，同样是该系统的流量，因此，同样是该系统。可以实时记录和分析气泡的2D顶视图。