DOI: 10.1002/2013JD020239
论文题名: Electrification of saltating particles in wind-blown sand: Experiment and theory
作者: Zhang H. ; Zheng X.-J. ; Bo T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 12086
结束页码: 12093
语种: 英语
英文关键词: charge-to-mass ratio of sand particles
Scopus关键词: Electric utilities
; Experiments
; Wind tunnels
; Charge-to-mass ratios
; Contact Electrification
; Measured results
; Multiple collisions
; Particle image velocimetries
; Saltating particles
; Sand particles
; Vertical profile
; Sand
; atmospheric electricity
; electrification
; experimental study
; salt
; sand
; wind forcing
; wind tunnel
英文摘要: The electrification of sand particles is a common phenomenon in wind-blown sand movement. The charge-to-mass ratio of particles is an important parameter to characterize the property of charged particles. However, understanding of the charge-to-mass ratio remains open, and significant discrepancies exist between previous contact electrification models and measurements. This work focuses on the charge-to-mass ratio of saltating particles in wind-blown sand. Experiments were carried out in a wind tunnel using sand particles with the mean diameter d̄=160μm. The motions of the saltating particles in the air flow were analyzed by particle image velocimetry, and the charge-to-mass ratios were determined by measuring both the charge and mass of saltating sand particles collected in a Faraday cup. The measured results show that the charge-to-mass ratio increases exponentially with the height above the surface and the vertical profiles of the charge-to-mass ratios can be reproduced well by considering the multiple collisions process between saltating particles and sand bed. In addition, the results suggest that the charge-to-mass ratio is determined by the number of collisions, impacting velocity, and sand grain diameter combined. Key Points Charge-to-mass ratio of sand particles was measured in a wind tunnel Discrepancies between theory and measurements can be resolved by our model The factors that affect charge-to-mass ratio are discussed ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 10972164
; 11072097
; 11121202
; 11202088
; 11232006
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63186
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou, China; Department of Mechanics, Lanzhou University, Lanzhou 730000, China; School of Electronical and Mechanical Engineering, Xidian University, Xi'an, China
Recommended Citation:
Zhang H.,Zheng X.-J.,Bo T.. Electrification of saltating particles in wind-blown sand: Experiment and theory[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)