Analysis of the motion of small-scale ellipsoidal particles in a horizontal laminar flow field--颗粒学报PARTICUOLOGY

Yang, L., Zhang, J., Yuan, H., & Mei, N. (2018). Analysis of the motion of small-scale ellipsoidal particles in a horizontal laminar flow field. Particuology, 40, 44-51. https://doi.org/10.1016/j.partic.2017.12.005

Analysis of the motion of small-scale ellipsoidal particles in a horizontal laminar flow field

Lin Yang, Ji Zhang, Han Yuan, Ning Mei ^*

Marine Engineering, College of Engineering, Ocean University of China, Qingdao 266100, China

10.1016/j.partic.2017.12.005

Volume 40, October 2018, Pages 44-51

Received 20 June 2017, Revised 21 November 2017, Accepted 8 December 2017, Available online 6 April 2018, Version of Record 28 July 2018.

E-mail: nmei@ouc.edu.cn

Highlights

• Motion of an ellipsoidal particle in a horizontal laminar flow was studied experimentally.

• The entrained ellipsoidal particle achieved stable speed faster than a spherical one.

• The particle velocity was calculated based on modified BBO model.

Abstract

A particle movement model for a horizontal laminar flow field was established in this study, using a modified Basset–Boussinesq–Oseen equation for multiphase fluid dynamics. The motion of ellipsoidal and spherical particles in this flow field was compared to determine the differences in entrainment of ellipsoidal versus spherical particles. Our theoretical results indicate that ellipsoidal particles move more rapidly and smoothly within the fluid than spherical particles under the same conditions. Moreover, this feature is enhanced, as the ellipsoidal degree of the particle increases. Based on a dimensional analysis, flow experiments were carried out to verify the behavior of ellipsoidal versus spherical particles in practice. Both our theoretical and experimental results show that ellipsoidal particles approach the fluid velocity more quickly than spherical particles. Future work would need to address effects of velocity gradients and rotation on particle behavior.

Graphical abstract

Keywords

Solid–liquid two-phase flow; Horizontal laminar flow; Ellipsoidal particle; Ellipsoidal degree; Spherical particle; Velocity distribution

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