Gas–solid interaction force from direct numerical simulation (DNS) of binary systems with extreme diameter ratios--颗粒学报PARTICUOLOGY

Sarkar, S., Kriebitzsch, S. H. L., van der Hoef, M. A., & Kuipers, J. A. M. (2009a). Gas–solid interaction force from direct numerical simulation (DNS) of binary systems with extreme diameter ratios. Particuology, 7(4), 233–237. https://doi.org/10.1016/j.partic.2009.02.002

Gas–solid interaction force from direct numerical simulation (DNS) of binary systems with extreme diameter ratios

S. Sarkar, S.H.L. Kriebitzsch, M.A. van der Hoef^*, J.A.M. Kuipers

Department of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands

10.1016/j.partic.2009.02.002

Volume 7, Issue 4, August 2009, Pages 233-237

Received 5 November 2008, Accepted 27 February 2009, Available online 16 June 2009.

E-mail: m.a.vanderhoef@tnw.utwente.nl

Highlights

Abstract

Fluid–particle systems as commonly encountered in chemical, metallurgical and petroleum industries are mostly polydisperse in nature. However, the relations used to describe fluid–particle interactions are originally derived from monodisperse systems, with ad hoc modifications to account for polydispersity. In previous work it was shown that for bidisperse systems with moderate diameter ratios of 1:2 to 1:4, this approach leads to discrepancies, and a correction factor is needed. In this work we demonstrate that this correction factor also holds for more extreme diameter ratios of 1:5, 1:7 and 1:10, although the force on the large particles is slightly overestimated when using the correction factor. The main origin of the correction is that the void surrounding the large particles becomes less in case of a bidisperse mixture, as compared to a monodisperse system with the same volume fraction. We further investigated this discrepancy by calculating the volume per particle by means of Voronoi tessellation.

Graphical abstract

Keywords

Bidisperse; Fluid–particle interaction force; Lattice Boltzmann simulation; Direct numerical simulation

文章导读