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TRR 75:  Droplet Dynamics Under Extreme Ambient Conditions

Subject Area Thermal Engineering/Process Engineering
Chemistry
Computer Science, Systems and Electrical Engineering
Mathematics
Term from 2010 to 2021
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 84292822
 
Final Report Year 2022

Final Report Abstract

Droplets play a central role in many areas of nature and technology. Here, many of these processes take place under extreme environmental conditions. These can be, for example, very high or low temperatures or the influence of strong electrical fields. Many of these processes with droplets, which take place under extreme environmental conditions, are already widely used in technical systems today, although the fundamentals of them are still not fully understood. Based on this starting point, the SFB-TRR 75 was launched in 2010 as a transregional Collaborative Research Centre between the University of Stuttgart and the Technical University of Darmstadt. The declared aim of the SFB-TRR 75 was to gain a deeper, more detailed physical understanding of processes with droplets under extreme environmental conditions. Based on this, ways to describe such processes analytically and numerically were identified and implemented. More precise predictions of the processes and a better understanding of the elementary processes that occur made it possible to improve the prediction of larger systems. The knowledge gained was applied to selected systems as examples. Comparisons of the predictions with the actual behavior of the systems served as a continuous, critical review of all the results of the investigations. In order to take into account the broad spectrum of the occurring processes, the SFB-TRR 75 was divided into three project areas (PB): • Project Area A: Methodological basics • Project Area B: Free drops • Project Area C: Drops with wall interaction. In PB-A, the necessary basics for the projects are provided and further developed. These were physical, mathematical and numerical basics as well as methods for visualization and the provision of material properties, which were required for many subprojects. In PB-B, droplets without wall contact were investigated. This ranged from highly supercooled droplets in clouds to droplets in cryogenic rocket combustion chambers to droplet and spray systems in vicinity of the critical point. Finally, in PB-C, the interaction of droplets and sprays with a solid wall was investigated for various processes. Here, transport processes in the drop-wall interaction with phase transition liquid/vapor and liquid/solid and under the influence of strong electric fields were investigated in detail. By examining single droplets (first funding phase) and small droplet groups (second funding phase), the SFB-TRR 75 had increasingly oriented itself in the third funding period towards complex systems, as also reflected in the guiding examples. However, the basic principles were still investigated. Thus, the SFB-TRR 75 was able to make a considerable contribution to the topic under consideration in the course of its term, as evidenced by a large number of well-cited publications, among other things. The unique experimental data and validated numerical tools are now available to calculate and predict complex processes of droplets under extreme environmental conditions much better.

Publications

 
 

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