Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017JD027905 |
Effects of Shape and Rotation of Sand Particles in Saltation | |
Dun, Hongchao; Huang, Ning; Zhang, Jie; He, Wei | |
2018-12-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
![]() |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:23页码:13462-13471 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Eolian sand transport is a typical gas-solid flow process, and saltating sand particles account for 75% of the total sand transported. Sand particles are considered as perfect spheres, and the forces acted on the particles are calculated using concise formulas in almost all wind-sand movement models. In fact, most of sand particles in natural environment are nonspherical and usually rotating while they saltate in the air, and the complicated turbulent gas-solid flow caused by irregular shape and rotation of particles cannot be predicted. In this paper, the microcosmic midair movements of rotating elliptical sand particles are simulated with dynamic grid method, and the interaction between airflow and sand particles is studied. The results show that the trajectory of a rotating elliptical particle is 18.8% higher and 31.8% longer than that of a spherical one and the drag force acted on a rotating elliptical sand particle fluctuates periodically over time. Separating, colliding, and tumbling behaviors are observed during the saltation process of coupled sand particles. Affected by strong interaction between rotating coupled elliptical particles and airflow, the trajectory is 8.4% lower than one particle system, and the rotation decreases the midair colliding behaviors. A parametric scheme for drag coefficient of sand particle is summarized to modified the macroscopical Eulerian-Lagrangian wind-sand simulation, in which the saltation transport rate varies for different shapes of sand particles. This work indicts that an accurate prediction of shape and rotation effects is required to describe the sand movement and saltation transport. |
英文关键词 | nonspherical sand particle rotation drag force |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000455285500024 |
WOS关键词 | NUMERICAL-SIMULATION ; STEADY ; VELOCITY ; MAGNUS ; FLOW ; DRAG |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33582 |
专题 | 气候变化 |
作者单位 | Lanzhou Univ, Key Lab Mech Disaster & Environm Western China, Lanzhou, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Dun, Hongchao,Huang, Ning,Zhang, Jie,et al. Effects of Shape and Rotation of Sand Particles in Saltation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(23):13462-13471. |
APA | Dun, Hongchao,Huang, Ning,Zhang, Jie,&He, Wei.(2018).Effects of Shape and Rotation of Sand Particles in Saltation.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(23),13462-13471. |
MLA | Dun, Hongchao,et al."Effects of Shape and Rotation of Sand Particles in Saltation".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.23(2018):13462-13471. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论