Influence of liquid layers on energy absorption during particle impact--颗粒学报PARTICUOLOGY

Antonyuk, S., Heinrich, S., Deen, N., & Kuipers, H. (2009). Influence of liquid layers on energy absorption during particle impact. Particuology, 7(4), 245–259. https://doi.org/10.1016/j.partic.2009.04.006

Influence of liquid layers on energy absorption during particle impact

Sergiy Antonyuk ^a *, Stefan Heinrich ^a, Niels Deen ^b, Hans Kuipers ^b

a Hamburg University of Technology, Institute of Solids Process Engineering and Particle Technology, Denickestr. 15, 21071 Hamburg, Germany
b University of Twente, Fundamentals of Chemical Reaction Engineering, Faculty of Science and Technology, PO Box 217, Enschede 7500 AE, The Netherlands

10.1016/j.partic.2009.04.006

Volume 7, Issue 4, August 2009, Pages 245-259

Received 9 March 2009, Accepted 7 April 2009, Available online 3 July 2009.

E-mail: antonyuk@tu-harburg.de

Highlights

Abstract

The influence of the thickness of a covering liquid layer and its viscosity as well as the impact velocity on energy loss during the normal impact on a flat steel wall of spherical granules with a liquid layer was studied. Free-fall experiments were performed to obtain the restitution coefficient of elastic–plastic γ-Al₂O₃ granules by impact on the liquid layer, using aqueous solutions of hydroxypropyl methylcellulose with different concentrations for variation of viscosity (1–300 mPa s). In the presence of a liquid layer, increase of liquid viscosity decreases the restitution coefficient and the minimum thickness of the liquid layer at which the granule sticks to the wall. The measured restitution coefficients were compared with experiments performed without liquid layer. In contrast to the dry restitution coefficient, due to viscous losses at lower impact velocity, higher energy dissipation was obtained. A rational explanation for the effects obtained was given by results of numerically solved force and energy balances for a granule impact on a liquid layer on the wall. The model takes into account forces acting on the granule including viscous, surface tension, capillary, contact, drag, buoyancy and gravitational forces. Good agreement between simulations and experiments has been achieved.

Graphical abstract

Keywords

Granule impact; Restitution coefficient; Energy dissipation; Liquid layer; Liquid bridge

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