Electrification of saltating particles in wind-blown sand: Experiment and theory

被引:8
|
作者
Zhang, Huan [1 ,2 ]
Zheng, Xiao-Jing [1 ,2 ,3 ]
Bo, Tianli [1 ,2 ]
机构
[1] Lanzhou Univ, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Peoples R China
[2] Lanzhou Univ, Dept Mech, Lanzhou 730000, Peoples R China
[3] Xidian Univ, Sch Elect & Mech Engn, Xian, Peoples R China
基金
国家教育部科学基金资助; 中国国家自然科学基金;
关键词
GRANULAR INSULATOR SYSTEMS; CONTACT ELECTRIFICATION; VOLCANIC PLUMES; ELECTRIC-FIELD; SANDSTORMS; SIMULATION;
D O I
10.1002/2013JD020239
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
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 (d) over bar = 160 mu m. 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.
引用
收藏
页码:12086 / 12093
页数:8
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