Effects of surface roughness on shear viscosity

dc.contributor.authorPapanikolaou, Michail
dc.contributor.authorFrank, Michael
dc.contributor.authorDrikakis, Dimitris
dc.date.accessioned2019-05-22T15:35:29Z
dc.date.available2019-05-22T15:35:29Z
dc.date.issued2017-03-13
dc.description.abstractThis paper investigates the effect of surface roughness on fluid viscosity using molecular dynamics simulations. The three-dimensional model consists of liquid argon flowing between two solid walls whose surface roughness was modeled using fractal theory. In tandem with previously published experimental work, our results show that, while the viscosity in smooth channels remains constant across the channel width, in the presence of surface roughness it increases close to the walls. The increase of the boundary viscosity is further accentuated by an increase in the depth of surface roughness. We attribute this behavior to the increased momentum transfer at the boundary, a result of the irregular distribution of fluid particles near rough surfaces. Furthermore, although the viscosity in smooth channels has previously been shown to be independent of the strength of the solid-liquid interaction, here we show that in the presence of surface roughness, the boundary viscosity increases with the solid's wettability. The paper concludes with an analytical description of the viscosity as a function of the distance from the channel walls, the walls’ surface roughness, and the solid's wetting properties. The relation can potentially be used to adjust the fluid dynamics equations for a more accurate description of microfluidic systems.en_UK
dc.identifier.citationMichail Papanikolaou, Michael Frank, and Dimitris Drikakis. Effects of surface roughness on shear viscosity. Physical Review E, Volume 95, March 2017, Article number 033108en_UK
dc.identifier.issn1539-3755
dc.identifier.urihttps://doi.org/10.1103/PhysRevE.95.033108
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14197
dc.language.isoenen_UK
dc.publisherAmerican Physical Societyen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.titleEffects of surface roughness on shear viscosityen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Effects_of_surface_roughness_on_shear_viscosity-2017.pdf
Size:
1.07 MB
Format:
Adobe Portable Document Format
Description:
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description: