Turbulent, chemically reactive, multi-phase flows near walls

The TRR 150 teams up researchers from the TU Darmstadt and the Karlsruhe Institute of Technology to advance the fundamental understanding and modelling of chemical kinetics, complex three-phase flow, instationary near-wall heat transfer and turbulence-chemistry-wall interaction.

Andreas Dreizler,

Our results contribute to the development of efficient, low-emission energy converters or to reduce deposits in energy technology or chemical engineering, for example.

Picture: RSM

When walls and chemistry interact

The behavior of chemical reactions is exceptionally influenced by walls. This is important for various technologically and scientifically significant processes, such as the formation of pollutants in combustion systems, the formation of depositions interfering chemical processes in energy- and process technology or catalytic effects in general. Processes near walls are tremendously affecting new technological concepts, such as the design and development of new combustion engines, after-treatment of exhaust gases, gas turbines, power plants as well as process engineering. Despite their high importance, the underlying mechanisms as well as their mutual interaction are poorly understood.

These various scientific topics give rise to the overall objectives of the TRR 150, represented by the following three main research areas:

Video: TRR 150 in 3 minutes

In this video, TRR 150 spokesperson Prof. Dr. Andreas Dreizler summarizes the motivation and research questions of the Collaborative Research Center. The interaction of chemical reactions with transport processes (turbulence and diffusion) in the presence of a wall is being investigated. The aim is to gain a better understanding of the processes and, based on this, to develop mathematical models. These will then be integrated into overall models to demonstrate this predictive capability using appropriate systemic considerations.

(Video available in German language only)

All projects at a glance

Generic processes and diagnostics
Research Area A
Model development and simulation
Research Area B
Lead examples
Research Area C
Film evaporation and deposit formation – experiments
Film evaporation and deposit formation – simulations
In-cylinder processes – experiments
Drop/spray wall film interaction
Scalar field wall interaction – DNS
Fuel wall film interaction
Flame wall interaction
Scalar field wall interaction – modelling
In-cylinder processes – simulations
Liquid phase films, gas-phase boundary layers
Elementary kinetics
Emission control – experiments
Scalar field wall interaction – experiments
Multiphase reactions
Emission control – simulations
Transport processes in thin films
Reduced reaction models in-cylinder processes
Reduced reaction models emission control
Drop wall film interaction – DNS

Research areas

A: Generic processes and diagnostics

The underlying physicochemical mechanisms are investigated in simplified, generic environments using innovative measurement techniques. The focus is on electrofuels as well as exhaust gas aftertreatment using Selective-Catalytic-Reaction catalysts.

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B: Model developement and simulation

We develop and validate sub-models and high-resolution numerical simulations using experimental insights and data from A. The focus is on individual processes for future electrofuels as well as higher near-wall pressures and temperatures. From this, overall models for the interaction of chemical reactions, turbulent flow, multiphase processes and wall heat transfer are being developed.

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C: Lead examples

The new models and methods are applied to technically relevant processes and are critically evaluated. The focus is on internal combustion – including the electrofuels dimethyl carbonate and methyl formate – as well as reactive multi-phase flows in the exhaust train of IC engines.

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