Drying and percolation in spatially correlated porous media

Biswas, S., Fantinel, P., Borgman, O., Holtzman, R. and Goehring, L. ORCID: 0000-0002-3858-7295, 2018. Drying and percolation in spatially correlated porous media. Physical Review Fluids, 3 (12): 124307. ISSN 2469-990X

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We study how the dynamics of a drying front propagating through a porous medium are affected by small-scale correlations in material properties. For this, we first present drying experiments in micro-fluidic micro-models of porous media. Here, the fluid pressures develop more intermittent dynamics as local correlations are added to the structure of the pore spaces. We also consider this problem numerically, using a model of invasion percolation with trapping, and find that there is a crossover in invasion behaviour associated with the length-scale of the disorder in the system. The critical exponents that describe large enough events are similar to the classic invasion percolation problem, while the addition of a finite correlation length significantly affects the exponent values of avalanches and bursts, up to some characteristic size. We thus find that even a weak local structure can interfere with the universality of invasion percolation phenomena. This has implications for a variety of multi-phase flow problems, such as drying, drainage, and fluid invasion.

Item Type: Journal article
Publication Title: Physical Review Fluids
Creators: Biswas, S., Fantinel, P., Borgman, O., Holtzman, R. and Goehring, L.
Publisher: American Physical Society
Date: 21 December 2018
Volume: 3
Number: 12
ISSN: 2469-990X
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 21 Nov 2018 11:57
Last Modified: 25 Mar 2019 11:13
URI: https://irep.ntu.ac.uk/id/eprint/35093

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