Passive scalar interface in a spatially evolving mixing layer (A. Attili and D. Denker)

Quartz nozzle sampling (D. Felsmann)

Dissipation element analysis of a planar diffusion flame (D. Denker)

Turbulent/non-turbulent interface in a temporally evolving jet (D. Denker)

Dissipation elements crossing a flame front (D. Denker and B. Hentschel)

Particle laden flow (E. Varea)

Turbulent flame surface in non-premixed methane jet flame (D. Denker)

DNS of primary break up (M. Bode)

Diffusion flame in a slot Bunsen burner (S. Kruse)

Various quantities in spatially evolving jet diffusion flame (D. Denker)

Basics

Flame spray pyrolysis is a promising approach for the production of functional nanoparticles which are expected to lead to major advances in the development of batteries or catalysts, for example. Compared to existing large-scale gas phase processes, spray flame synthesis offers a higher variety of material systems and a good scalability. However, industrial-scale implementation is currently failing due to an insufficient understanding of the process. The DFG priority program SPP1980 aims to overcome these challenges in an interdisciplinary approach and lay the foundations for industrial distribution. In recent years, closely related sub-processes of flame spray pyrolysis have been successfully investigated in the various disciplines and a wealth of experimental, simulative, and theoretical instruments have been developed. In the priority program, these methodologies are brought together to analyze the individual sub-processes and to classify them into an overall model. This is intended to create a comprehensive understanding of the process.

An essential sub-process of the flame spray pyrolysis is the atomization of the precursor solution. The atomization forms the first sub-process in the process chain and provides the droplet phase. Through the evaporation of the droplets, the turbulent mixing with the dispersion gas and the subsequent combustion, the atomization has a direct or indirect influence on the local conditions (e.g. temperature, gas composition, velocity fluctuations). These local conditions significantly influence the particle synthesis mechanisms, so that atomization represents a degree of freedom to control and optimize particle product properties. To make use of this, however, a sufficient understanding of the influence of atomization on particle synthesis is necessary.


Methods

In order to numerically investigate the influence of atomization on particle synthesis, a simulation approach is chosen that covers the entire process chain of flame spray pyrolysis. The methods used are based on the relevant length and time scales of the subprocesses. The nozzle internal flow is characterized by large-eddy simulations while the primary breakup is investigated by interface resolving direct numerical simulations. Further downstream, droplet evaporation, mixing, combustion and particle formation are analyzed with large-eddy simulations using a Lagrange-Spray model, a turbulent combustion model and a statistical particle model.

Contact

Institut für Technische Verbrennung
RWTH Aachen University
Templergraben 64
52056 Aachen
Germany

Phone: +49 (0)241 80-94607
Fax: +49 (0)241 80-92923

Office hours: 09 a.m.-12 p.m.

office(at)itv.rwth-aachen.de

Library: +49 (0)241 80-9759


News

  • 30. November 2018
    Jonas Boschung receives Friedrich-Wilhelm Preis
  • 05. October 2018
    ITV receives Golden Spike Award
  • 09.September 2018
    ITV in the JARA-HPC annual report 
  • 01. August 2018
    Announcement: the 17. International Conference on Numerical Combustion will take place  6. - 8. of May 2019 in Aachen
  • 27.-28. June 2018
    In collaboration with the IRT and VKA, the ITV hosts the fourth Symposium for Combustion Control
  • 24. Mai 2018
    Collaboration of the ITV and the Jülich Supercomputing Center for the visualization of large scale simulation data
  • 22.-23. Mai 2018
    The ITV hosts the first Combustion-DNS Strategy & Data Analysis Workshop.