Simulation to quantify the dustiness of powders

T. Londershausen*, E. Schmidt, University of Wuppertal; M. Hennig, U. Teipel, Technical University of Nuremberg, Germany

The dustiness of a disperse solid can be understood as a property, which – when handled in a gaseous environment – behaves similar to an aerosol, releasing the respective particle fraction depending on the given quantity and size distribution. In general, this release of dust is undesirable because it might result in material loss, is often associated with personnel being exposed to it and may cause environmental pollution. The dustiness is therefore a product property, which might change along the process path, for example, through comminution, agglomeration, classification or mixing of the solids involved.

Within the scope of the DFG-focus program 1679 “Dynamic simulation of interlinked solid matter processes”, related property functions will be determined. These property functions describe the dustiness of powders caused by certain types of load and strain.

To simulate the dustiness of powders, two physically based model systems were developed. They were written in C++ specially for this purpose. Model A will be presented here as well as the results of the calculation made with the simulation. In system A, a powder mass with a given particle size distribution will be strained in such a way that a time-dependent particle volume concentration is created in the closed system boundaries. For this purpose, the newly defined fractionated grade of release R(x,t) will be introduced as property function. The fractionated grade of release describes the probability that particles with a given size leave the powder mass and move on to the gaseous phase. The experiments were carried out in cooperation with the Technical University of Nuremberg...

Session: G11 - Short Oral + Poster Presentations
Day: 12 October 2016
Time: 14:45 - 16:45 h

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