Modelling of particle formation
The modelling of particle formation will be pursued using two different approaches. One of the most common tools to describe particle forming processes is population balance modelling. In this case phenomena like agglomeration, layering, breakage and nucleation are taken into account by macroscopic kinetics. An alternative solution of the population balance can be achieved by probabilistic modeling, namely the Monte Carlo method. This method uses a sequence of discrete micro processes to calculate changes of the particle properties instead of macroscopic kinetics. This approach allows connecting product properties (e.g. particle size, porosity, moisture content and composition) and process conditions directly.  

Both approaches differ in the computational cost. Usually a population balance model is much faster than the Monte Carlo method. Since one of the major research topics in NaWiTec project is the control of particle forming processes, population balance models have to be used to develop control concepts and strategies. Therefor the Monte Carlo method will be used to describe particle structure depending on the process conditions. The results can be used to extract macroscopic kinetics for the population balance models.

This research topic continues previous investigations done by Terrazas-Velarde [1] and Dernedde [2], who dealt with stochastic modeling of fluidized bed spray agglomeration. In Terrazas-Velarde’s work the most relevant micro processes are modeled using a simplified particle structure. The developed model is able to describe experimental data with adjustment of the collision frequency. Dernedde developed a three dimensional algorithm for particle collisions leading to a more precise description of the resulting particle structure. The derived model is able to reconstruct the three dimensional particle structure from the simulation results.

In the near future the description of particle structures formed in fluidized bed spray granulation and coating processes is investigated. Experimental studies (Hoffmann [3]) show clearly different particle sizes and morphologies (porous and non-porous) for different drying conditions in the fluidized bed, see research topic “Formulation of structured particles in fluidized beds”. In order to generate particles with different structures specifically, appropriate models taking into account the forming of particle structures have to be created. Additionally the compacting of porous layers on granules will be investigated. Fluidized bed agglomeration with spraying of binder as well as agglomeration due to glass transition of the used materials will be part of the research in this project.

References

  1. Korina Terrazas-Velarde: Monte Carlo Simulation of Fluidized Bed Spray Agglomeration, Dissertation, Otto-von-Guericke-Universität Magdeburg, 2010
  2. Mathias Dernedde: Modellierung der Wirbelschicht-Sprühagglomeration unter Berücksichtigung der Partikelstrukturbildung, Dissertation, Otto-von-Guericke-Universität Magdeburg, 2013
  3. Hoffmann, T., Peglow, M., Tsotsas, E.: Investigation of growth kinetics for the fluidised bed spray granulation, 8th European Congress of Chemical Engineering 2011, Berlin

The research project is funded by the German Federal Ministry of Science and Education (BMBF) as part of the InnoProfile-Transfer project "Unternehmen Region".

Contact

M.Sc. Christian Rieck
Dates
University Course Drying 2020
30.03.2020 - 02.04.2020 in Magdeburg
University Course Fluidization Technology 2019
04.11.2019 - 07.11.2019 in Hamburg
News
Award for Maciej Jaskulski
Cluster WIGRATEC enters the next round
Arun S. Mujumdar Medal for Prof. E. Tsotsas
Award for best oral presentation
Award for best oral presentation for Christoph Neugebauer on Population Balance Modeling Conference 2018
Faculty Prize 2018
Award for Prof. E. Tsotsas
Honorary Professorship of UCTM, Sofia, for Prof. Tsotsas
University Course Drying 2018
19. March -- 22. March 2018 in Magdeburg
University Course Fluidization Technology 2017
6. - 9. November 2017 in Hamburg
Award on Conference
Best Research Award for Sayali Zarekar on IDS in Gifu, Japan
Award on Conference
Best Poster Award for Christian Rieck at PARTEC 2016 in Nuremberg, Germany
Award on Conference
Best poster award for Vesselin Idakiev at national conference
Award on Conference
Best Presentation Awards on Nordic Baltic Drying Conference 2015
ECCE 2015
27. September - 01. October 2015 in Nice, France
Granulation Workshop 2015
1st July - 3rd July 2015 in Sheffield, UK
University Course Drying 2016
29. March -- 01. April 2016 in Magdeburg
Extension of the Research Training Group 1554
Extension of the funding period for 4.5 years
Award on annual conference
Award for best poster presentation goes to Maryam Dadkhah
Modern Drying Technology Vol. 3
Prof. E. Tsotsas in CES Top 20 Reviewer 2010
Award on Asia Pacific Drying Conference
VDI Ehrenring für Jun.-Prof. Mirko Peglow
University Course Drying 2014
Fundamentals and Applications of Drying Technology