Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions

Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions

Abstract Two-phase flow interfacial dynamics in rough fractures is fundamental to understanding fluid transport in fractured media. The Haines jump of non-Darcy flow in porous media has been investigated at pore scales, but its fundamental processes in rough fractures remain unclear. In this study,...

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Autores principales: Chun Chang, Yang Ju, Heping Xie, Quanlin Zhou, Feng Gao
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
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Acceso en línea:https://doaj.org/article/e6bdaf5498014adaa57ecb7c9767ba67
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spelling oai:doaj.org-article:e6bdaf5498014adaa57ecb7c9767ba672021-12-02T15:05:56ZNon-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions10.1038/s41598-017-04819-x2045-2322https://doaj.org/article/e6bdaf5498014adaa57ecb7c9767ba672017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04819-xhttps://doaj.org/toc/2045-2322Abstract Two-phase flow interfacial dynamics in rough fractures is fundamental to understanding fluid transport in fractured media. The Haines jump of non-Darcy flow in porous media has been investigated at pore scales, but its fundamental processes in rough fractures remain unclear. In this study, the micron-scale Haines jump of the air-water interface in rough fractures was investigated under drainage conditions, with the air-water interface tracked using dyed water and an imaging system. The results indicate that the interfacial velocities represent significant Haines jumps when the meniscus passes from a narrow “throat” to a wide “body”, with jump velocities as high as five times the bulk drainage velocity. Locally, each velocity jump corresponds to a fracture aperture variation; statistically, the velocity variations follow an exponential function of the aperture variations at a length scale of ~100 µm to ~100 mm. This spatial-scale-invariant correlation may indicate that the high-speed local velocities during the Haines jump would not average out spatially for a bulk system. The results may help in understanding the origin of interface instabilities and the resulting non-uniform phase distribution, as well as the micron-scale essence of the spatial and temporal instability of two-phase flow in fractured media at the macroscopic scale.Chun ChangYang JuHeping XieQuanlin ZhouFeng GaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Chun Chang
Yang Ju
Heping Xie
Quanlin Zhou
Feng Gao
Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
description Abstract Two-phase flow interfacial dynamics in rough fractures is fundamental to understanding fluid transport in fractured media. The Haines jump of non-Darcy flow in porous media has been investigated at pore scales, but its fundamental processes in rough fractures remain unclear. In this study, the micron-scale Haines jump of the air-water interface in rough fractures was investigated under drainage conditions, with the air-water interface tracked using dyed water and an imaging system. The results indicate that the interfacial velocities represent significant Haines jumps when the meniscus passes from a narrow “throat” to a wide “body”, with jump velocities as high as five times the bulk drainage velocity. Locally, each velocity jump corresponds to a fracture aperture variation; statistically, the velocity variations follow an exponential function of the aperture variations at a length scale of ~100 µm to ~100 mm. This spatial-scale-invariant correlation may indicate that the high-speed local velocities during the Haines jump would not average out spatially for a bulk system. The results may help in understanding the origin of interface instabilities and the resulting non-uniform phase distribution, as well as the micron-scale essence of the spatial and temporal instability of two-phase flow in fractured media at the macroscopic scale.
format article
author Chun Chang
Yang Ju
Heping Xie
Quanlin Zhou
Feng Gao
author_facet Chun Chang
Yang Ju
Heping Xie
Quanlin Zhou
Feng Gao
author_sort Chun Chang
title Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
title_short Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
title_full Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
title_fullStr Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
title_full_unstemmed Non-Darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
title_sort non-darcy interfacial dynamics of air-water two-phase flow in rough fractures under drainage conditions
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/e6bdaf5498014adaa57ecb7c9767ba67
work_keys_str_mv AT chunchang nondarcyinterfacialdynamicsofairwatertwophaseflowinroughfracturesunderdrainageconditions
AT yangju nondarcyinterfacialdynamicsofairwatertwophaseflowinroughfracturesunderdrainageconditions
AT hepingxie nondarcyinterfacialdynamicsofairwatertwophaseflowinroughfracturesunderdrainageconditions
AT quanlinzhou nondarcyinterfacialdynamicsofairwatertwophaseflowinroughfracturesunderdrainageconditions
AT fenggao nondarcyinterfacialdynamicsofairwatertwophaseflowinroughfracturesunderdrainageconditions
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