| 稀释体系气溶胶粒子近壁动力特性及壁面影响 |
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| 引用本文： | 杨怡菲,姜泽毅,张欣欣,张欣茹,柳翠翠.稀释体系气溶胶粒子近壁动力特性及壁面影响[J].北京科技大学学报,2008,30(11). |
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| 作者姓名： | 杨怡菲 姜泽毅 张欣欣 张欣茹 柳翠翠 |
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| 作者单位： | 北京科技大学机械工程学院,北京,100083 |
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| 基金项目： | 国家自然科学基金
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| 摘 要： | 以极端稀释气溶胶体系中单个粒子为研究对象,建立了考虑受重力浮升力、表面势力和布朗热动力作用的运动控制方程,运用布朗动力学方法数值模拟了近壁处气溶胶粒子的动力特性规律. 结果表明,壁面之上一定范围内(约50个气溶胶粒子半径)存在一个壁面影响区,区域中气溶胶粒子的动力特性有别于无界大空间中的气溶胶粒子,且其厚度远大于壁面对粒子作用力的范围(约1个粒子半径). 最后讨论了不同表面特性、不同粒子半径时壁面影响区的变化规律.
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| 关 键 词： | 气溶胶体系 气溶胶粒子 动力特性 壁面效应 |
Dynamics of wall-adjacent aerosol particles in a dilute system and wall effect |
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| YANG Yifei,JIANG Zeyi,ZHANG Xinxin,ZHANG Xinru,LIU Cuicui.Dynamics of wall-adjacent aerosol particles in a dilute system and wall effect[J].Journal of University of Science and Technology Beijing,2008,30(11). |
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| Authors: | YANG Yifei JIANG Zeyi ZHANG Xinxin ZHANG Xinru LIU Cuicui |
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| Institution: | YANG Yifei,JIANG Zeyi,ZHANG Xinxin,ZHANG Xinru,LIU Cuicui School of Mechanical Engineering,University of Science , Technology Beijing,Beijing 100083,China |
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| Abstract: | The trajectory function of a single aerosol particle in a dilute gas system close to a wall was theoretically studied with consideration of different forces such as gravity-buoyancy,particle-wall interaction and Brownian force.The results indicate that there is a wall effect layer in which the particle shows a different dynamic characteristic from that in unlimited space.The wall effect layer is about 50 radii of the particle,which is much higher than the effective range of particle-wall interaction,about 1... |
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| Keywords: | dilute system aerosol particles wall-adjacent movement wall effect layer |
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