Effect of fractal particle size distribution on the mobility of dry granular flows
This paper performs a numerical investigation on the kinetic behaviors of dry granular flows generated by the collapse of granular columns with different fractal particle size distributions (FPSDs) using the discrete element method. The FPSD has a remarkable impact on the regime and mobility of a gr...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2021-09-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0065051 |
| _version_ | 1818989800124841984 |
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| author | Zhiqiang Lai Dong Chen Enhui Jiang Lianjun Zhao Luis E. Vallejo Wei Zhou |
| author_facet | Zhiqiang Lai Dong Chen Enhui Jiang Lianjun Zhao Luis E. Vallejo Wei Zhou |
| author_sort | Zhiqiang Lai |
| collection | DOAJ |
| description | This paper performs a numerical investigation on the kinetic behaviors of dry granular flows generated by the collapse of granular columns with different fractal particle size distributions (FPSDs) using the discrete element method. The FPSD has a remarkable impact on the regime and mobility of a granular flow. As the fractal dimension of a granular assembly increases, the translational velocities of the particles increase in the horizontal direction, whereas the rotational velocities decrease. The number of particles involved in the horizontal spreading increases due to the decreasing intensity of the contact shearing particle behavior. These increased translational velocities in the horizontal direction effectively facilitate particle spreading. A boundary layer is formed at the front bottom of the granular body in which the clockwise rotational velocities of particles are significantly increased, thereby benefiting particle spreading. The whole front of the granular flow obtains an immense spreading velocity. Moreover, the translational and rotational characteristics are dependent on the particle size. Smaller particles tend to translate and rotate faster than larger particles because of the greater particle contact forces of the former. As the fractal dimension increases, medium- and large-size particles obtain less kinetic energy than do small-size particles. Therefore, small-size particles play a crucial role in the mobility of granular flows in a granular assembly with a high fractal dimension. |
| first_indexed | 2024-12-20T19:44:14Z |
| format | Article |
| id | doaj.art-10de357308a147aaaa16c7b82265f478 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-20T19:44:14Z |
| publishDate | 2021-09-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-10de357308a147aaaa16c7b82265f4782022-12-21T19:28:27ZengAIP Publishing LLCAIP Advances2158-32262021-09-01119095113095113-1510.1063/5.0065051Effect of fractal particle size distribution on the mobility of dry granular flowsZhiqiang Lai0Dong Chen1Enhui Jiang2Lianjun Zhao3Luis E. Vallejo4Wei Zhou5Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, ChinaKey Laboratory of Water Cycle and Relate Land Surface Process, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaYellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, ChinaYellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, ChinaDepartment of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USAKey Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, ChinaThis paper performs a numerical investigation on the kinetic behaviors of dry granular flows generated by the collapse of granular columns with different fractal particle size distributions (FPSDs) using the discrete element method. The FPSD has a remarkable impact on the regime and mobility of a granular flow. As the fractal dimension of a granular assembly increases, the translational velocities of the particles increase in the horizontal direction, whereas the rotational velocities decrease. The number of particles involved in the horizontal spreading increases due to the decreasing intensity of the contact shearing particle behavior. These increased translational velocities in the horizontal direction effectively facilitate particle spreading. A boundary layer is formed at the front bottom of the granular body in which the clockwise rotational velocities of particles are significantly increased, thereby benefiting particle spreading. The whole front of the granular flow obtains an immense spreading velocity. Moreover, the translational and rotational characteristics are dependent on the particle size. Smaller particles tend to translate and rotate faster than larger particles because of the greater particle contact forces of the former. As the fractal dimension increases, medium- and large-size particles obtain less kinetic energy than do small-size particles. Therefore, small-size particles play a crucial role in the mobility of granular flows in a granular assembly with a high fractal dimension.http://dx.doi.org/10.1063/5.0065051 |
| spellingShingle | Zhiqiang Lai Dong Chen Enhui Jiang Lianjun Zhao Luis E. Vallejo Wei Zhou Effect of fractal particle size distribution on the mobility of dry granular flows AIP Advances |
| title | Effect of fractal particle size distribution on the mobility of dry granular flows |
| title_full | Effect of fractal particle size distribution on the mobility of dry granular flows |
| title_fullStr | Effect of fractal particle size distribution on the mobility of dry granular flows |
| title_full_unstemmed | Effect of fractal particle size distribution on the mobility of dry granular flows |
| title_short | Effect of fractal particle size distribution on the mobility of dry granular flows |
| title_sort | effect of fractal particle size distribution on the mobility of dry granular flows |
| url | http://dx.doi.org/10.1063/5.0065051 |
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