Non-linear multiphase flow in hydrophobic porous media

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Authors

Yihuai Zhang , Branko Bijeljic, Martin Blunt

Abstract

Multiphase flow in porous materials is conventionally described by an empirical extension to Darcy’s law which assumes that the pressure gradient is proportional to flow rate. Through a series of two-phase flow experiments, we demonstrate that even when capillary forces are dominant at the pore scale, there is a non-linear intermittent flow regime with a power-law dependence between pressure gradient and flow rate. Energy balance is used to predict accurately the start of the intermittent regime in hydrophobic porous media. The pore-scale explanation of the behaviour based on the periodic filling of critical flow pathways is confirmed through 3D micron-resolution X-ray imaging.

DOI

https://doi.org/10.31223/X5V63C

Subjects

Engineering, Physical Sciences and Mathematics

Keywords

multiphase flow, porous media, non-linear flow, intermittent flow, energy balance

Dates

Published: 2021-11-08 23:13

Last Updated: 2021-11-09 07:13

License

CC BY Attribution 4.0 International

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