Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction
Slit dams can eliminate the risk of particle overload accumulation, which can be safer in controlling debris flow compared with a completely closed dam. In attempting to better use the energy dissipation effect of particle collision and reduce the impact of the dam body, referring to the traditional...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-09-01
|
| Series: | Water |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4441/14/18/2772 |
| _version_ | 1797481257292005376 |
|---|---|
| author | Yingguang Fang Hao Liu Lingfeng Guo Xiaolong Li |
| author_facet | Yingguang Fang Hao Liu Lingfeng Guo Xiaolong Li |
| author_sort | Yingguang Fang |
| collection | DOAJ |
| description | Slit dams can eliminate the risk of particle overload accumulation, which can be safer in controlling debris flow compared with a completely closed dam. In attempting to better use the energy dissipation effect of particle collision and reduce the impact of the dam body, referring to the traditional slit dam, this paper proposed one with tilted baffles in the downstream direction. Discrete element simulation and several flume model experiments were carried out herein to verify the advantages and explore the applicable conditions of this tilted baffle slit dam, in which the particle trapping efficiency and the change law of impact force of the tilted baffles under the conditions of different inclined angles, opening sizes, and particle sizes were studied. The results show that: 1. when the inclination angle is 30° ≤ <i>θ</i> ≤ 45°, the tilted baffles can dissipate more particle kinetic energy than the transverse baffles; 2. the maximum impact force and trapping efficiency of the tilted baffles decrease with the increase in the width diameter ratio <i>b</i>/<i>d</i>, with the opening width <i>b</i> of the slit to the particle diameter <i>d</i>; 3. with the given particle size of 6 mm ≤ <i>d</i> ≤ 14 mm, the range that the tilted baffles can effectively intercept the particles flowing down is 0 ≤ <i>b</i>/<i>d</i> ≤ 4, and it reaches the ideal interception state near 1 ≤ <i>b</i>/<i>d</i> ≤ 2, where, relatively, the impact force is weak, and the interception efficiency is high. |
| first_indexed | 2024-03-09T22:11:56Z |
| format | Article |
| id | doaj.art-0096ed1eccab446b8661355b35781bc9 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-09T22:11:56Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-0096ed1eccab446b8661355b35781bc92023-11-23T19:29:47ZengMDPI AGWater2073-44412022-09-011418277210.3390/w14182772Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream DirectionYingguang Fang0Hao Liu1Lingfeng Guo2Xiaolong Li3School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSlit dams can eliminate the risk of particle overload accumulation, which can be safer in controlling debris flow compared with a completely closed dam. In attempting to better use the energy dissipation effect of particle collision and reduce the impact of the dam body, referring to the traditional slit dam, this paper proposed one with tilted baffles in the downstream direction. Discrete element simulation and several flume model experiments were carried out herein to verify the advantages and explore the applicable conditions of this tilted baffle slit dam, in which the particle trapping efficiency and the change law of impact force of the tilted baffles under the conditions of different inclined angles, opening sizes, and particle sizes were studied. The results show that: 1. when the inclination angle is 30° ≤ <i>θ</i> ≤ 45°, the tilted baffles can dissipate more particle kinetic energy than the transverse baffles; 2. the maximum impact force and trapping efficiency of the tilted baffles decrease with the increase in the width diameter ratio <i>b</i>/<i>d</i>, with the opening width <i>b</i> of the slit to the particle diameter <i>d</i>; 3. with the given particle size of 6 mm ≤ <i>d</i> ≤ 14 mm, the range that the tilted baffles can effectively intercept the particles flowing down is 0 ≤ <i>b</i>/<i>d</i> ≤ 4, and it reaches the ideal interception state near 1 ≤ <i>b</i>/<i>d</i> ≤ 2, where, relatively, the impact force is weak, and the interception efficiency is high.https://www.mdpi.com/2073-4441/14/18/2772particle–baffle interactionslit damimpact forcetrapping efficiencyarching effect |
| spellingShingle | Yingguang Fang Hao Liu Lingfeng Guo Xiaolong Li Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction Water particle–baffle interaction slit dam impact force trapping efficiency arching effect |
| title | Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction |
| title_full | Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction |
| title_fullStr | Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction |
| title_full_unstemmed | Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction |
| title_short | Model Experiment Exploration of the Kinetic Dissipation Effect on the Slit Dam with Baffles Tilted in the Downstream Direction |
| title_sort | model experiment exploration of the kinetic dissipation effect on the slit dam with baffles tilted in the downstream direction |
| topic | particle–baffle interaction slit dam impact force trapping efficiency arching effect |
| url | https://www.mdpi.com/2073-4441/14/18/2772 |
| work_keys_str_mv | AT yingguangfang modelexperimentexplorationofthekineticdissipationeffectontheslitdamwithbafflestiltedinthedownstreamdirection AT haoliu modelexperimentexplorationofthekineticdissipationeffectontheslitdamwithbafflestiltedinthedownstreamdirection AT lingfengguo modelexperimentexplorationofthekineticdissipationeffectontheslitdamwithbafflestiltedinthedownstreamdirection AT xiaolongli modelexperimentexplorationofthekineticdissipationeffectontheslitdamwithbafflestiltedinthedownstreamdirection |