Packings of micron-sized spherical particles – Insights from bulk density determination, X-ray microtomography and discrete element simulations

Schmidt J, Parteli EJ, Uhlmann N, Wörlein N, Wirth KE, Pöschel T, Peukert W (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Advanced Powder Technology Elsevier

DOI: 10.1016/j.apt.2020.03.018

Abstract

The quantitative description of packing behaviour of particulate systems under consideration of realistic particle size distributions and material properties poses one challenging problem in powder technology, with impacts on a broad range of technological areas. Here we investigate the packing characteristics of micrometer to millimeter-sized, polydisperse spherical particle systems of glass, zirconia and copper by means of experimental measurements of the bulk density, X-ray microtomography (CT) and numerical simulations of the granular packings using a 3d discrete element method (DEM). The applied DEM method takes realistic material properties into account and considers the experimentally obtained particle size distributions as well as attractive inter-particle forces including adhesion (Johnson, Kendall, Roberts (JKR)) and non-bonded van der Waals (vdW) interactions. Good agreement of the packing densities predicted by DEM and observed in the experiments (bulk density determination & CT) is found. Moreover, we show that a simple mathematical expression for the packing fraction as a function of average particle size of the polydisperse powder system describes well our experimental and simulation results for all investigated materials, with only two fitting parameters. From the DEM simulations, the mean (first) coordination number in the respective polydisperse packing is extracted and discussed with respect to the experimentally obtained direct neighborhood detection from X-ray tomography and in context of previous works. The mean coordination number shows a rather broad variance due to the polydispersity of the samples considered. It also shows a remarkable dependency on the definition of particle contact. Therefore, caution is advised when evaluating coordination numbers with this quantity being highly dependent on the instrumental resolution.

Authors with CRIS profile

Jochen Schmidt Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Karl-Ernst Wirth Technische Fakultät Thorsten Pöschel Lehrstuhl für Multiscale Simulation of Particulate Systems Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Related research project(s)

Production of functional polymer particles via liquid-based top-down processes (A1) (SFB 814 (A1)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023 Simulation of the production process using particles of complex geometric shape (B1) (SFB 814 (B1)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023

Involved external institutions

Universität zu Köln DE Germany (DE) Fraunhofer-Institut für Integrierte Systeme und Bauelementetechnologie (IISB) DE Germany (DE)

How to cite

APA:

Schmidt, J., Parteli, E.J., Uhlmann, N., Wörlein, N., Wirth, K.-E., Pöschel, T., & Peukert, W. (2020). Packings of micron-sized spherical particles – Insights from bulk density determination, X-ray microtomography and discrete element simulations. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2020.03.018

MLA:

Schmidt, Jochen, et al. "Packings of micron-sized spherical particles – Insights from bulk density determination, X-ray microtomography and discrete element simulations." Advanced Powder Technology (2020).

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