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Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition

Although the slippery boundary condition (BC) has been validated to enhance fracture permeability (k), the coupling effects of heterogeneous slippery BC and inertia on k remain less understood. We used computational fluid dynamics to investigate the competing roles of slippery BC and inertial forces...

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Detalles Bibliográficos
Autores principales: Liu, Benhua, Zhan, Hao, Liu, Yiran, Qi, Huan, Huang, Linxian, Wei, Zhengrun, Liu, Zhizheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7325568/
https://www.ncbi.nlm.nih.gov/pubmed/32481531
http://dx.doi.org/10.3390/ijerph17113817
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author Liu, Benhua
Zhan, Hao
Liu, Yiran
Qi, Huan
Huang, Linxian
Wei, Zhengrun
Liu, Zhizheng
author_facet Liu, Benhua
Zhan, Hao
Liu, Yiran
Qi, Huan
Huang, Linxian
Wei, Zhengrun
Liu, Zhizheng
author_sort Liu, Benhua
collection PubMed
description Although the slippery boundary condition (BC) has been validated to enhance fracture permeability (k), the coupling effects of heterogeneous slippery BC and inertia on k remain less understood. We used computational fluid dynamics to investigate the competing roles of slippery BC and inertial forces in controlling k evolution with increasing pressure gradient by designing six cases with different slip length scenarios for a two-dimensional natural fracture. Our results suggest that pronounced inertial effects were directly related to and demonstrated by the growth of recirculation zone (RZ); this caused flow regimes transitioning from Darcy to non-Darcy and significantly reduced k, with an identical tailing slope for six cases, regardless of the variability in slip lengths. Moreover, the slippery BC dominantly determine the magnitude of k with orders depending on the slip length. Lastly, our study reveals that the specific k evolution path for the case with a varying slip length was significantly different from other cases with a homogeneous one, thus encouraging more efforts in determining the slip length for natural fractures via experiments.
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spelling pubmed-73255682020-07-14 Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition Liu, Benhua Zhan, Hao Liu, Yiran Qi, Huan Huang, Linxian Wei, Zhengrun Liu, Zhizheng Int J Environ Res Public Health Article Although the slippery boundary condition (BC) has been validated to enhance fracture permeability (k), the coupling effects of heterogeneous slippery BC and inertia on k remain less understood. We used computational fluid dynamics to investigate the competing roles of slippery BC and inertial forces in controlling k evolution with increasing pressure gradient by designing six cases with different slip length scenarios for a two-dimensional natural fracture. Our results suggest that pronounced inertial effects were directly related to and demonstrated by the growth of recirculation zone (RZ); this caused flow regimes transitioning from Darcy to non-Darcy and significantly reduced k, with an identical tailing slope for six cases, regardless of the variability in slip lengths. Moreover, the slippery BC dominantly determine the magnitude of k with orders depending on the slip length. Lastly, our study reveals that the specific k evolution path for the case with a varying slip length was significantly different from other cases with a homogeneous one, thus encouraging more efforts in determining the slip length for natural fractures via experiments. MDPI 2020-05-28 2020-06 /pmc/articles/PMC7325568/ /pubmed/32481531 http://dx.doi.org/10.3390/ijerph17113817 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Benhua
Zhan, Hao
Liu, Yiran
Qi, Huan
Huang, Linxian
Wei, Zhengrun
Liu, Zhizheng
Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition
title Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition
title_full Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition
title_fullStr Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition
title_full_unstemmed Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition
title_short Effects of Slip Length and Inertia on the Permeability of Fracture with Slippery Boundary Condition
title_sort effects of slip length and inertia on the permeability of fracture with slippery boundary condition
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7325568/
https://www.ncbi.nlm.nih.gov/pubmed/32481531
http://dx.doi.org/10.3390/ijerph17113817
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