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Journal of Nanotechnology
Volume 2018, Article ID 6548689, 6 pages
https://doi.org/10.1155/2018/6548689
Research Article

Simulation and Visualization of Flows Laden with Cylindrical Nanoparticles in a Mixing Layer

1College of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China
2Department of Mechanics, Zhejiang University, Hangzhou 310027, China

Correspondence should be addressed to Wenqian Lin; nc.ude.ujz@qwnil

Received 31 January 2018; Accepted 27 February 2018; Published 5 April 2018

Academic Editor: Mingzhou Yu

Copyright © 2018 Wenqian Lin and Peijie Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The motion of cylindrical particles in a mixing layer is studied using the pseudospectral method and discrete particle model. The effect of the Stokes number and particle aspect ratio on the mixing and orientation distribution of cylindrical particles is analyzed. The results show that the rollup of mixing layer drives the particles to the edge of the vortex by centrifugal force. The cylindrical particles with the small Stokes number almost follow fluid streamlines and are mixed thoroughly, while those with the large Stokes number, centrifugalized and accumulated at the edge of the vortex, are poorly mixed. The mixing degree of particles becomes worse as the particle aspect ratio increases. The cylindrical particles would change their orientation under two torques and rotate around their axis of revolution aligned to the vorticity direction when the shear rate is low, while aligning on the flow-gradient plane beyond a critical shear rate value. More particles are oriented with the flow direction, and this phenomenon becomes more obvious with the decrease of the Stokes number and particle aspect ratio.