Experimental study on the permeability of crushed coal medium based on the Ergun equation

Abstract Accurate determination of the permeability of crushed coal medium is the basis for the study of their permeability characteristics. To investigate the permeability characteristics of this special porous medium composed of crushed coal particles, the permeability parameters of crushed coal s...

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Autores principales:	Mingkun Pang, Tianjun Zhang, Yukai Meng, Zhiqiang Ling
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7bb5af7b0ac04f57919746a7a4809493
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spelling	oai:doaj.org-article:7bb5af7b0ac04f57919746a7a48094932021-12-05T12:13:09ZExperimental study on the permeability of crushed coal medium based on the Ergun equation10.1038/s41598-021-02524-42045-2322https://doaj.org/article/7bb5af7b0ac04f57919746a7a48094932021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02524-4https://doaj.org/toc/2045-2322Abstract Accurate determination of the permeability of crushed coal medium is the basis for the study of their permeability characteristics. To investigate the permeability characteristics of this special porous medium composed of crushed coal particles, the permeability parameters of crushed coal specimens of different initial porosities were measured by designing a lateral-limit compression seepage test system. Parameters were determined separately for specimens of different initial porosities. (1) the Reynolds number distribution region characterising the seepage state was determined and obtained. Specimens with initial porosity distribution between 0.02 and 0.08, and seepage Reynolds number distribution in the low-permeability zone, under Darcy flow; (2) the intrinsic permeability of the crushed coal medium was obtained by using the Ergun equation. The complex inverse proportional relationship between the drag coefficient and Reynolds number was derived; (3) Through the determination of the permeability of the crushed coal medium, the mean value of βK value was obtained to be about 45.7, and the analysis of the permeability of porous medium can determine its critical permeability. The relationship between the Forchheimer number Fo and critical Reynolds number was measured. The results indicate that it conforms to a linear distribution. In-depth analysis of these two parameters can be used to explore the flow transition process between laminar, transition, and turbulent flow. This study provides insight into the permeability characteristics of the media in fractured coal bodies.Mingkun PangTianjun ZhangYukai MengZhiqiang LingNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mingkun Pang Tianjun Zhang Yukai Meng Zhiqiang Ling Experimental study on the permeability of crushed coal medium based on the Ergun equation
description	Abstract Accurate determination of the permeability of crushed coal medium is the basis for the study of their permeability characteristics. To investigate the permeability characteristics of this special porous medium composed of crushed coal particles, the permeability parameters of crushed coal specimens of different initial porosities were measured by designing a lateral-limit compression seepage test system. Parameters were determined separately for specimens of different initial porosities. (1) the Reynolds number distribution region characterising the seepage state was determined and obtained. Specimens with initial porosity distribution between 0.02 and 0.08, and seepage Reynolds number distribution in the low-permeability zone, under Darcy flow; (2) the intrinsic permeability of the crushed coal medium was obtained by using the Ergun equation. The complex inverse proportional relationship between the drag coefficient and Reynolds number was derived; (3) Through the determination of the permeability of the crushed coal medium, the mean value of βK value was obtained to be about 45.7, and the analysis of the permeability of porous medium can determine its critical permeability. The relationship between the Forchheimer number Fo and critical Reynolds number was measured. The results indicate that it conforms to a linear distribution. In-depth analysis of these two parameters can be used to explore the flow transition process between laminar, transition, and turbulent flow. This study provides insight into the permeability characteristics of the media in fractured coal bodies.
format	article
author	Mingkun Pang Tianjun Zhang Yukai Meng Zhiqiang Ling
author_facet	Mingkun Pang Tianjun Zhang Yukai Meng Zhiqiang Ling
author_sort	Mingkun Pang
title	Experimental study on the permeability of crushed coal medium based on the Ergun equation
title_short	Experimental study on the permeability of crushed coal medium based on the Ergun equation
title_full	Experimental study on the permeability of crushed coal medium based on the Ergun equation
title_fullStr	Experimental study on the permeability of crushed coal medium based on the Ergun equation
title_full_unstemmed	Experimental study on the permeability of crushed coal medium based on the Ergun equation
title_sort	experimental study on the permeability of crushed coal medium based on the ergun equation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7bb5af7b0ac04f57919746a7a4809493
work_keys_str_mv	AT mingkunpang experimentalstudyonthepermeabilityofcrushedcoalmediumbasedontheergunequation AT tianjunzhang experimentalstudyonthepermeabilityofcrushedcoalmediumbasedontheergunequation AT yukaimeng experimentalstudyonthepermeabilityofcrushedcoalmediumbasedontheergunequation AT zhiqiangling experimentalstudyonthepermeabilityofcrushedcoalmediumbasedontheergunequation
_version_	1718372140361711616

Experimental study on the permeability of crushed coal medium based on the Ergun equation

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