摘要
建立了描述在来流水平风场和由于地表热扩散产生的垂向风场联合作用下的风沙流发展过程的基本方程.通过定量分析表明:地表热扩散和风沙电场对风沙流发展过程的影响十分明显.在此基础上,给出地表热扩散和风沙电场对风沙流中的沙粒跃移轨迹、输沙率以及风沙流达到充分发展的时间等的影响规律.
A theoretical model was suggested to mathematically describe the effect of thermal diffusion firom a sand-bed on evolution of a wind-blown sand flow. An upward wind field was engendered by the thermal diffusion and the coupling interaction among the horizontal and upward wind flow, saltating grains, and a kind of electrostatic force exerted on the grains were considered in this theoretical model. The numerical results show that the effect of the thermal diffusion on the evolution process of wind-blown grain flow is quite obvious and very similar to the effect of the electrostatic force on the evolution. Not only the time for the entire system to reach a steady state （ called the duration time）, the transport rate of grains, the mass-flux profiles and the trajectory of saltating grains are affected by the thermal diffusion and the electrostatic force exerted on saltating grains, but also the wind profiles and the temperature profiles at the steady state are affected by the wind-blown sand flow.
出处
《应用数学和力学》
CSCD
北大核心
2007年第2期165-175,共11页
Applied Mathematics and Mechanics
基金
科技部国家重点基础研究发展规划项目(G2000048702)
教育部重点科技项目资助课题
关键词
热扩散
输沙率
风沙电场
跃移运动
多场耦合
thermal diffusion
transport rate of grains
electrostatic field
wind-blown grains
multifield coupling
