Open Access

Transport and Deposition of Angular Fibers in Turbulent Channel Flows

Authors: Zhang, Haifeng1; Ahmadi, Goodarz1; Asgharian, Bahman2

Source: Aerosol Science and Technology, Volume 41, Number 5, May 2007 , pp. 529-548(20)

Publisher: Taylor and Francis Ltd

Buy & download fulltext article:

Open Access The full text is Open Access.

View now:
PDF

Abstract:

Transport and deposition of angular fibrous particles in turbulent channel flows were studied. The instantaneous fluid velocity field was generated by the direct numerical simulation (DNS) of the Navier-Stokes equation via a pseudo-spectral method. An angular fibers was assumed to consist of two elongated ellipsoids attached at their tips. For a dilute suspension of fibers, a one-way coupling assumption was used in that the flow carries the fibers, but the coupling effect of the fiber on the flow was neglected. The particle equations of motion used included the hydrodynamic forces and torques, the shear-induced lift and the gravitational forces. The hydrodynamic interactions of the high aspect ratio linkage were assumed to be negligibly small. Euler's four parameters (quaternions) were used for describing the time evolution of fiber orientations. Ensembles of fiber trajectories and orientations in turbulent channel flows were generated and statistically analyzed. The results were compared with those for spherical particles and straight fibers and their differences were discussed. Effects of fiber size, aspect ratio, fiber angle, turbulence near wall eddies, and various forces were studied. The DNS predictions were compared with experimental data for straight fibers and a proposed empirical equation model.

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/02786820701272004

Affiliations: 1: Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York, USA 2: Chemical Industry Institute of Toxicology Research, Triangle Park, North Carolina, USA

Publication date: May 1, 2007

More about this publication?
Related content

Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page