Numerical simulation of the sticking process of glass-microparticles to a flat wall to represent pollutant-particles treatment in a multi-channel cyclone--颗粒学报PARTICUOLOGY

Jasevičius, R., Kruggel-Emden, H., & Baltrėnas, P. (2017). Numerical simulation of the sticking process of glass-microparticles to a flat wall to represent pollutant-particles treatment in a multi-channel cyclone. Particuology, 32, 112-131. https://doi.org/10.1016/j.partic.2016.09.009

Numerical simulation of the sticking process of glass-microparticles to a flat wall to represent pollutant-particles treatment in a multi-channel cyclone

Raimondas Jasevičius ^{a b *}, Harald Kruggel-Emden ^c, Pranas Baltrėnas ^b

a Institute of Mechanical Science, Vilnius Gediminas Technical University, Lithuania
b Research Institute of Environmental Protection, Vilnius Gediminas Technical University, Lithuania
c Department of Mechanical Process Engineering and Materials Processing, Technical University Berlin, Germany

10.1016/j.partic.2016.09.009

Volume 32, June 2017, Pages 112-131

Received 30 June 2015, Revised 6 September 2016, Accepted 22 September 2016, Available online 20 February 2017, Version of Record 20 April 2017.

E-mail: raimondas.jasevicius@vgtu.lt

Highlights

• Sticking of ultrafine particles, which are dangerous to human health, was examined.

• Under small impact angles sticking can be utilized for air cleaning.

• Exemplary adhesive ultrafine glass particles were numerically investigated.

• In the model energy dissipation mechanisms related to adhesion were applied.

• Results indicate that the theoretical model is capable to represent the sticking process.

Abstract

Ultrafine particles are dangerous to human health and are usually difficult to separate from airflow because of their low inertia, which helps them to stick easily to surfaces because of adhesive forces. This characteristic provides opportunities for adhesive ultrafine particle separation by designing air-cleaning devices that exploit the sticking ability. To understand governing effects in such air-cleaning devices, which can be designed as multi-channel cyclones, the sticking of adhesive spherical glass particles under oblique impact has been investigated numerically by using the discrete element method. An adhesive dissipative contact model was applied by implementing different interaction forces for various-sized ultrafine pollutant particles. Normal loading is represented by the elastic Hertz contact model, whereas viscous damping is described by the modified nonlinear Tsuji model. The influence of deformation-dependent adhesive forces for a range of ultrafine particle sizes is illustrated during the sticking process. Dissipative oscillations during the sticking process were observed because of the influence of viscous damping forces.

Graphical abstract

Keywords

Adhesion; Discrete element method; Microparticles; Multi-channel cyclone; Sticking process; Boundary layer

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