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Capillary transport in paper porous materials at low saturation levels: normal, fast or superfast?

Lukyanov, A., Mitkin, V., Pryer, T., Penpark, S. and Theofanous, T. (2020) Capillary transport in paper porous materials at low saturation levels: normal, fast or superfast? Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 476 (2244). ISSN 1364-5021

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To link to this item DOI: 10.1098/rspa.2020.0488

Abstract/Summary

The problem of capillary transport in fibrous porous materials at low levels of liquid saturation has been addressed. It has been demonstrated, that the process of liquid spreading in this type of porous materials at low saturation can be described macroscopically by a similar super-fast, non-linear diffusion model as that, which had been previously identified in experiments and simulations in particulate porous media. The macroscopic diffusion model has been underpinned by simulations using a microscopic network model. The theoretical results have been qualitatively compared with available experimental observations within the witness card technique using persistent liquids. The long-term evolution of the wetting spots was found to be truly universal and fully in line with the mathematical model developed. The result has important repercussions on the witness card technique used in field measurements of dissemination of various low volatile agents in imposing severe restrictions on collecting and measurement times.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
ID Code:93977
Publisher:Royal Society Publishing

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