| Effect of thermal diffusion and electrostatic force on evolution of wind-blown sand flow |
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| 作者姓名： | 岳高伟 郑晓静 |
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| 作者单位： | The Key Laboratory of Western China's Environmental Systems Department of Mechanics，Lanzhou University，The Key Laboratory of Western China's Environmental Systems，Department of Mechanics，Lanzhou University，Lanzhou 730000，P.R.China，Lanzhou 730000，P.R.China |
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| 基金项目： | 国家重点基础研究发展计划(973计划);教育部重点科学与技术基金 |
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| 摘 要： | A theoretical model is suggested to mathematically describe the effect of thermal diffusion from a sand-bed on evolution of a wind-blown sand flow.An upward wind field is 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 are 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.
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| 关 键 词： | 热扩散 静电场 流体力学 风场 |
| 收稿时间： | 2006-01-11 |
| 修稿时间： | 2006-10-24 |
Effect of thermal diffusion and electrostatic force on evolution of wind-blown sand flow |
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| Yue Gao-wei,Zheng Xiao-jing.Effect of thermal diffusion and electrostatic force on evolution of wind-blown sand flow[J].Applied Mathematics and Mechanics(English Edition),2007,28(2):183-192. |
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| Authors: | Yue Gao-wei Zheng Xiao-jing |
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| Institution: | The Key Laboratory of Western China's Environmental Systems, Department of Mechanics,Lanzhou University, Lanzhou 730000, P. R. China |
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| Abstract: | A theoretical model is suggested to mathematically describe the effect of thermal diffusion from a sand-bed on evolution of a wind-blown sand flow.An upward wind field is 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 are 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. |
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| Keywords: | thermal diffusion transport rate of grains electrostatic field wind-blown grains multi-field coupling |
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