Thermodynamic Effects on Particle Movement:Wind Tunnel Simulation Results

作     者：NIU Qinghe QU Jianjun ZHANG Kecun LIU Xianwan 

作者机构：Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China Dunhuang Gobi and Desert Research Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Dunhuang 736200 China Gansu Center for Sand Hazard Reduction Engineering and Technology Lanzhou 730000 China 

出 版 物：《Chinese Geographical Science》 (中国地理科学（英文版）)

年 卷 期：2012年第22卷第2期

页      面：178-187页

核心收录：

学科分类：080702[工学-热能工程] 07[理学] 08[工学] 070602[理学-大气物理学与大气环境] 0807[工学-动力工程及工程热物理] 0706[理学-大气科学] 

基　　金：Under the auspices of National Natural Science Foundation of China (No. 40930741, 41071009, 41001005) Knowledge Innovation Programs of Chinese Academy of Sciences (No. KZCX2-YW-329) 

主　　题：thermodynamic effect threshold wind velocity nel simulation drifting sand flux structure sand transport rate wind tunnel simulation 

摘      要：Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles.