Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Mortensen, P.H.; Andersson, H.I.; Gillissen, J.J.J.; Boersma, B.J.

doi:doi:10.1063/1.2975209

Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Title

Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Author

Mortensen, P.H.
Andersson, H.I.
Gillissen, J.J.J.
Boersma, B.J.

Faculty

Applied Sciences

Department

Multi-Scale Physics

Date

2008-09-09

Abstract

The dynamical behavior of tiny elongated particles in a directly simulated turbulent flow field is investigated. The ellipsoidal particles are affected both by inertia and hydrodynamic forces and torques. The time evolution of the particle orientation and translational and rotational motions in a statistically steady channel flow is obtained for six different particle classes. The focus is on the influence of particle aspect ratio ? and the particle response time on the particle dynamics, i.e., distribution, orientation, translation, and rotation. Both ellipsoidal and spherical particles tend to accumulate in the viscous sublayer and preferentially concentrate in regions of low-speed fluid velocity. The translational motion is practically unaffected by the aspect ratio, whereas both mean and fluctuating spin components depend crucially on ?. The ellipsoids tend to align themselves with the mean flow direction and this tendency becomes more pronounced in the wall proximity when the lateral tilting of the elongated particles is suppressed.

Subject

channel flow
flow instability
turbulence
two-phase flow

To reference this document use:

http://resolver.tudelft.nl/uuid:41f590a7-a3a9-4d28-a9f3-27fe6dccc209

DOI

https://doi.org/10.1063/1.2975209

Publisher

American Institute of Physics

ISSN

1070-6631

Source

http://link.aip.org/link/PHFLE6/v20/i9/p093302/s1