Effect of correcting near-wall forces on nanoparticle transport in a microchannel--颗粒学报PARTICUOLOGY

Andarwa, S., Basirat Tabrizi, H., & Ahmadi, G. (2014). Effect of correcting near-wall forces on nanoparticle transport in a microchannel. Particuology, 16, 84–90. https://doi.org/10.1016/j.partic.2013.11.007

Effect of correcting near-wall forces on nanoparticle transport in a microchannel

S. Andarwa ^a, H. Basirat Tabrizi^a *, G. Ahmadi ^b

a Department of Mechanical Engineering, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
b Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5700, USA

10.1016/j.partic.2013.11.007

Volume 16, October 2014, Pages 84-90

Received 10 July 2013, Revised 2 October 2013, Accepted 16 November 2013, Available online 27 January 2014.

E-mail: hbasirat@aut.ac.ir; hbtabrizi@gmail.com

Highlights

• Influence of near-wall corrections on nanoparticle transport in microchannels was investigated.

• Correction effects on capture efficiency and average penetration of nanoparticles were studied.

• Average penetration of the captured nanoparticles increased by inclusion of the wall effects.

• Inclusion of the wall effects is important for simulating nanoparticle transport in microchannels.

Abstract

This paper studies the importance of corrections that account for the presence of walls on the forces acting on nanoparticles during their transport in microchannels. Theoretical and experimental investigations have reported anisotropic and hindered motion of nanoparticles near a microchannel wall. To investigate the influence of the near-wall effects, various conditions were examined. In particular, computer simulations were performed with and without the near-wall correction of forces. The corresponding capture efficiency and the average penetration of the captured nanoparticles were compared, and the importance of the near-wall corrections was assessed. Effects were evaluated for the nanoparticle diameter, the channel width, the channel length, and the pressure gradient. The results indicate that the inclusion of wall effects is crucial for the analysis of nanoparticle transport in microchannels.

Graphical abstract

Keywords

Nanoparticle; Microchannel; Wall-presence effect; Capture efficiency; Hindered diffusion

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