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Physics of Fluids : Dynamics of prolate ellipsoidal particles in a turbulent channel flow

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

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Book Id: WPLBN0002169592
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 9 September 2008

Title: Physics of Fluids : Dynamics of prolate ellipsoidal particles in a turbulent channel flow  
Author: P. H. Mortensen, H. I. Andersson, J. J. J. Gillissen, and B. J. Boersma
Volume: Issue : September 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Fluids Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Mortensen, H. I. Andersson, J. J. J. Gillissen, And B. J. Boersm, P. H. (n.d.). Physics of Fluids : Dynamics of prolate ellipsoidal particles in a turbulent channel flow. Retrieved from http://hawaiilibrary.net/


Description
Description: 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 λ 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 λ. 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.

 

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