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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-11-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-02524-4 |
| _version_ | 1818345059262660608 |
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| author | Mingkun Pang Tianjun Zhang Yukai Meng Zhiqiang Ling |
| author_facet | Mingkun Pang Tianjun Zhang Yukai Meng Zhiqiang Ling |
| author_sort | Mingkun Pang |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-13T16:56:21Z |
| format | Article |
| id | doaj.art-7bb5af7b0ac04f57919746a7a4809493 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-13T16:56:21Z |
| publishDate | 2021-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-7bb5af7b0ac04f57919746a7a48094932022-12-21T23:37:55ZengNature PortfolioScientific Reports2045-23222021-11-0111111010.1038/s41598-021-02524-4Experimental study on the permeability of crushed coal medium based on the Ergun equationMingkun Pang0Tianjun Zhang1Yukai Meng2Zhiqiang Ling3Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of EducationKey Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of EducationKey Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of EducationCollege of Safety Science and Engineering, Xi’an University of Science and TechnologyAbstract 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.https://doi.org/10.1038/s41598-021-02524-4 |
| spellingShingle | Mingkun Pang Tianjun Zhang Yukai Meng Zhiqiang Ling Experimental study on the permeability of crushed coal medium based on the Ergun equation Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-021-02524-4 |
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