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Dynamics of water imbibition through paper with swelling
Journal of fluid mechanics, 2020-06, Vol.892, Article A39
[Peer Reviewed Journal]
The Author(s), 2020. Published by Cambridge University Press ;ISSN: 0022-1120 ;EISSN: 1469-7645 ;DOI: 10.1017/jfm.2020.219
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Title:
Dynamics of water imbibition through paper with swelling
Author:
Chang, Sooyoung
;
Kim, Wonjung
Subjects:
Absorption
;
Capillary flow
;
Cellulose
;
Cellulose fibers
;
Contact angle
;
Dynamic tests
;
Dynamics
;
Environmental scanning
;
Experiments
;
Fibers
;
Humidity
;
Imbibition
;
Mathematical models
;
Microfluidics
;
Porous materials
;
Porous media
;
Swelling
;
Voids
;
Water
;
Water absorption
Is Part Of:
Journal of fluid mechanics, 2020-06, Vol.892, Article A39
Description:
We present a combined experimental and theoretical investigation of the dynamics of water imbibition through paper with swelling. The Washburn equation has been widely used to describe the dynamics of the liquid absorption in paper, but its prediction of liquid imbibition speed has been reported to be inaccurate. Our recent study (Chang et al. , J. Fluid Mech. , vol. 845, 2018, pp. 36–50) demonstrated that the internal cavity of cellulose fibres composing the paper is partially responsible for the limited accuracy of the Washburn equation based on oil imbibition experiments. Here we extend the investigation to water absorption through paper with swelling. We demonstrate that the swelling of the cellulose fibre network in addition to the internal voids of the cellulose fibres crucially affects the imbibition dynamics. Based on the microscopic observation that paper swelling is caused by the expansion of inter-fibre space, we suggest a mathematical model for water imbibition which considers both intra-fibre voids and swelling. By introducing parameters that characterize the swelling speed and volume of paper, our model markedly improves prediction of the water imbibition speed. The results provide not only a theoretical background for designing paper-based microfluidic systems, but also new insights into capillary flow through expandable porous media.
Publisher:
Cambridge: Cambridge University Press
Language:
English
Identifier:
ISSN: 0022-1120
EISSN: 1469-7645
DOI: 10.1017/jfm.2020.219
Source:
ProQuest Academic
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