干旱区生态环境知识资源中心(Arid): Reinvestigation of the scaling law of the windblown sand launch velocity with a wind tunnel experiment

Arid

	Reinvestigation of the scaling law of the windblown sand launch velocity with a wind tunnel experiment
	Zhang Yang; Li Min; Wang Yuan; Yang Bin
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2019
卷号	11 期号:5 页码:664-673
英文摘要	Windblown sand transport is a leading factor in the geophysical evolution of arid and semi-arid regions. The evolution speed is usually indicated by the sand transport rate that is a function of launch velocity of sand particle, which has been investigated by the experimental measurement and numerical simulation. However, the obtained results in literatures are inconsistent. Some researchers have discovered a relation between average launch velocity and wind shear velocity, while some other researchers have suggested that average launch velocity is independent of wind shear velocity. The inconsistence of launch velocity leads to a controversy in the scaling law of the sand transport rate in the windblown case. On the contrary, in subaqueous case, the scaling law of the sand transport rate has been widely accepted as a cubic function of fluid shear velocity. In order to explain the debates surrounding the windblown case and the difference between windblown and subaquatic cases, this study reinvestigates the scaling law of the vertical launch velocity of windblown transported sand particles by using a dimensional analysis in consideration of the compatibility of the characteristic time of sand particle motion and that of air flow. Then a wind tunnel experiment is conducted to confirm the revisited scaling law, where the sand particle motion pictures are recorded by a high-speed camera and then the launch velocity is solved by the particle tracking velocimetry. By incorporating the results of dimensional analysis and wind tunnel experiment, it can be concluded that, the ratio of saltons number to reptons number determines the scaling law of sand particle launch velocity and that of sand transport rate, and using this ratio is able to explain the discrepancies among the classical models of steady sand transport. Moreover, the resulting scaling law can explain the sand sieving phenomenon: a greater fraction of large grains is observed as the distance to the wind tunnel entrance becomes larger.
英文关键词	windblown sand transport scaling law launch velocity dimensional analysis wind tunnel
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Geology
CSCD记录号	CSCD:6595731
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336191
作者单位	Zhang Yang, Department of Fluid Machinery and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.; Li Min, Department of Fluid Machinery and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.; Wang Yuan, Department of Fluid Machinery and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.; Yang Bin, School of Chemical Engineering, Northwest University, Xi'an, Shaanxi 710069, China.
推荐引用方式 GB/T 7714	Zhang Yang,Li Min,Wang Yuan,et al. Reinvestigation of the scaling law of the windblown sand launch velocity with a wind tunnel experiment[J],2019,11(5):664-673.
APA	Zhang Yang,Li Min,Wang Yuan,&Yang Bin.(2019).Reinvestigation of the scaling law of the windblown sand launch velocity with a wind tunnel experiment.Journal of Arid Land,11(5),664-673.
MLA	Zhang Yang,et al."Reinvestigation of the scaling law of the windblown sand launch velocity with a wind tunnel experiment".Journal of Arid Land 11.5(2019):664-673.