Coefficient of restitution for particles impacting on wet surfaces: An improved experimental approach--颗粒学报PARTICUOLOGY

Crüger, B., Salikov, V., Heinrich, S., Antonyuk, S., Sutkar, V. S., Deen, N. G., & Kuipers, J. A. M. (2016). Coefficient of restitution for particles impacting on wet surfaces: An improved experimental approach. Particuology, 25, 1-9. https://doi.org/10.1016/j.partic.2015.04.002

Coefficient of restitution for particles impacting on wet surfaces: An improved experimental approach

B. Crüger ^a *, V. Salikov ^a, S. Heinrich ^a, S. Antonyuk ^b, V.S. Sutkar ^c, N.G. Deen ^c, J.A.M. Kuipers ^c

a Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, Denickestrasse 15, 21073 Hamburg, Germany
b Particle Process Engineering, Department of Mechanical and Process Engineering, University of Kaiserslautern, Gottlieb-Daimler-Strasse, 67663 Kaiserslautern, Germany
c Multiphase Reactors Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

10.1016/j.partic.2015.04.002

Volume 25, April 2016, Pages 1-9

Received 3 December 2014, Revised 10 April 2015, Accepted 14 April 2015, Available online 30 June 2015, Version of Record 18 February 2016.

E-mail: britta.crueger@tuhh.de

Highlights

• Experimental setup consists of two high-speed cameras and a confocal sensor.

• Measurement accuracy of the wet coefficient of restitution (COR) was significantly enhanced.

• Effects of 3D collision capture and direct liquid layer measurement on COR accuracy were discussed.

• COR was investigated in a parametric study.

Abstract

The coefficient of restitution is widely used to characterize the energy dissipation rate in numerical simulations involving particle collisions. The challenge in measuring the coefficient of restitution is the strong scatter seen in experimental data that results from varying particle properties, i.e. shape and surface roughness, and from imperfections in the experimental technique. To minimize this scattering, a novel experimental setup was developed based on two synchronized high-speed cameras capturing the collision behaviour of a particle in three dimensions. To measure the wet restitution coefficient, which describes particle impact in the presence of a liquid layer in the contact region, additional accuracy can be achieved by measuring the liquid layer thickness by a high-precision optical confocal sensor. The coefficient of restitution was measured for glass particles with two different diameters, at different relative velocities and liquid layer thicknesses, with a focus on small collision velocities and thin liquid layers, using both the improved (three dimensional) and the conventional (two dimensional) approaches to quantify the improvement of the new method's accuracy.

Graphical abstract

Keywords

Particle impact; Coefficient of restitution; Liquid layer; Improved experimental setup

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