Analysis of sand particles' lift-off and incident velocities in wind-blown sand flux

作者：Bo, Tian-Li^*; Zheng, Xiao-Jing; Duan, Shao-Zhen; Liang, Yi-Rui

来源：Acta Mechanica Sinica, 2013, 29(2): 158-165.

DOI：10.1007/s10409-013-0020-7

• Probability distribution
• Sand particles' horizontal velocities
• Sand particles' vertical velocities
• Center of the Gaussian distribution
• Decay constant of the negative exponential distribution

In the research of windblown sand movement, the lift-off and incident velocities of saltating sand particles play a significant role in bridging the spatial and temporal scales from single sand particle's motion to windblown sand flux. In this paper, we achieved wind tunnel measurements of the movement of sand particles near sand bed through improving the wind tunnel experimental scheme of particle image velocimetry (PIV) and data processing method. And then the influence of observation height on the probability distributions of lift-off and incident velocities of sand particles was analyzed. The results demonstrate that the observation height has no obvious influence on the distribution pattern of the lift-off and incident velocities of sand particles, i.e., the probability distribution of horizontal and vertical velocities of lift-off and incident sand particles follow a Gaussian distribution and a negative exponential distribution, respectively. However, it influences the center of the Gaussian distribution, the decay constant and the amplitude of the negative exponential distribution.

• 出版日期2013-4
• 单位兰州大学