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Dynamics of directional soluble wicking

Published online by Cambridge University Press:  16 March 2021

Sohyun Jung ,
Wonjung Kim Open the ORCID record for Wonjung Kim [Opens in a new window]  and
Ho-Young Kim Open the ORCID record for Ho-Young Kim [Opens in a new window]
Sohyun Jung
Affiliation:
Department of Mechanical Engineering, Seoul National University, Seoul08826, Korea
Wonjung Kim*
Affiliation:
Department of Mechanical Engineering, Sogang University, Seoul04107, Korea
Ho-Young Kim*
Affiliation:
Department of Mechanical Engineering, Seoul National University, Seoul08826, Korea
*
†Email addresses for correspondence: wonjungkim@sogang.ac.kr, hyk@snu.ac.kr
†Email addresses for correspondence: wonjungkim@sogang.ac.kr, hyk@snu.ac.kr
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Abstract

Liquids can invade fibrous porous media when the fibres are either wettable or soluble, and the infiltration rate can differ depending on spatial distribution of fibres as well as liquid properties. With continuing developments in dissolution-driven release mechanisms of porous drugs and chemical pattern formations, the understanding of how liquids spontaneously infiltrate into soluble fibrous media is strongly called for. Here we show that unlike capillarity-driven insoluble wicking (exhibiting diffusive growth of wetting distance with time), the wicking distance in soluble porous media grows linearly with time as dominated by liquid viscosity rather than surface tension. Such soluble wicking is highly sensitive to flow orientation relative to fibre alignment, so that it arises only in the crosswise direction while being strongly inhibited in the lengthwise direction. We present a theoretical model to explain the experimentally measured wicking rates in soluble porous media.

JFM classification

Interfacial Flows (free surface): Capillary flows Low-Reynolds-number flows: Porous media Micro-/Nano-fluid dynamics: Microfluidics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 915 , 25 May 2021 , A58
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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