Numerical Modeling of Ion-Size Effect on Electroosmotic Flow in Nanochannels

-, Rajni and Kumar, Prashant (2019) Numerical Modeling of Ion-Size Effect on Electroosmotic Flow in Nanochannels. Proceedings of the Jangjeon Mathematical Society, 22 (1). pp. 193-200. ISSN 15987264

[thumbnail of PJMS2019.pdf] Text
PJMS2019.pdf - Published Version
Restricted to Registered users only
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (1MB) | Request a copy


When fluids are confined in a structure at nanoscale, such as in a na- nochannel. the electric double layers (EDLs) from opposite walls may have strong interactions. This phenomena results in EDL overlap, which leads to significant changes in the electric field and the fluid properties. Electroosmotic flow (EOF) describes the motion of electrolyte due to the existence of an EDL. Ions in electrolyte have finite sizes which become comparable to EDL thickness in nanochannels and thus cannot be neglected during the formulation. Ion size have been shown to influence the extent of EDL overlapping in channel [S. Das and S. Chakraborty, Physical Review E, vol. 84, p. 012501, 2011]. The electrokinetic effects for a system that are not less than lOnm are examined, where van der Waals forces cease to be significant compared to the electrostatic forces. Thus, it is appropriate to apply continuum equations in modeling. For systems below lOnm the continuum approach is not applicable but the understanding based on continuum modeling are still beneficial as a quantitative reference. In this paper, the electroosmotic flow in nanochannels is investigated by using the asymmetric ion size model proposed by [ Y. Han, S. Huang, and T. Yan, Journal of Physics: Condensed Matter, vol. 26, p. 284103, 2014]. The effect of size of ions on the flow behavior in nanochannels is examined. The average electroosmotic mobility is obtained for both the cases of symmetric and asymmetric ion sizes for different nanochannel widths

Item Type: Article
Keywords: Electric double layer | Electroosmotic flow | Navier- stokes equation | Steric effect
Subjects: Physical, Life and Health Sciences > Mathematics
JGU School/Centre: Jindal Global Business School
Depositing User: Shilpi Rana
Date Deposited: 07 Jan 2022 08:45
Last Modified: 07 Jan 2022 08:45
Official URL:
Additional Information: This research work was supported by CFD lab at POSTECH under the guidance of Prof. In Seok Kang. The research work was supported by Department of Applied Science(Mathematics) National Institute of Technology, Delhi.


Downloads per month over past year

Actions (login required)

View Item
View Item