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DY: Fachverband Dynamik und Statistische Physik

DY 33: Granular Matter and Granular Dynamics I

DY 33.8: Vortrag

Mittwoch, 18. März 2020, 11:45–12:00, ZEU 118

Triboelectric charges in granular materials, from their measurement to their effects — •Geoffroy Lumay and Nicolas Vandewalle — GRASP Laboratory, CESAM Research Unit, University of Liège, Belgium

It is well known in industrial applications involving powders and granular materials that the presence of electrostatic charges influences drastically the material properties. The apparition of electrostatic charges is due to the triboelectric effect at the contacts between the grains and also at the contacts between the grains and the container. This triboelectric effect in granular materials is drastically influenced by humidity and is still poorly understood from a fundamental point of view. Moreover, reproducible electrostatic measurements are difficult to perform. A few years ago, we developed an experimental device dedicated to the measurement of powder triboelectric properties. This device is now commercialized under the name GranuCharge by the company GranuTools and measures the ability of a powder to charge electrostatically during a flow in contact with a selected material. In this presentation, we will analyse the link between powder electrostatic properties, hygrometry and powder macroscopic properties (packing fraction, cohesiveness, flow, ...) from a fundamental point of view. Afterward, we will show how flow aid agents can be used to decrease the cohesiveness of industrial powders by playing a role on both capillary and electrostatic forces.

This study was conducted in the framework of the PowderReg project, funded by the European programme Interreg VA GR