Surface renewal as a significant mechanism for dust emission
Surface renewal as a significant mechanism for dust emission
复制标题
DOI：
10.5194/acp-16-15517-2016
复制
发表时间：
2016-12
影响因子：
6.3
通讯作者：
Jie Zhang;Teng Zhenjiao;N. Huang;Lei Guo;Y. Shao
中科院分区：
文献类型：
--
作者：
Jie Zhang;Teng Zhenjiao;N. Huang;Lei Guo;Y. Shao
抽象的。为了更好地了解粉尘排放机理，对不同土壤表面的粉尘排放进行了风洞实验。详细分析了表面更新对气动卷吸和跃移轰击的影响。它被发现，流动条件，表面粒子运动（跳跃和蠕变），土壤粉尘含量和地面障碍物都强烈影响粉尘排放，导致其速率变化的数量级。空气动力学夹带是非常有效的，如果灰尘供应是无限的，因为在我们的风洞运行的前2-3分钟。虽然空气动力学夹带抑制粉尘供应限制，表面更新通过表面颗粒的运动似乎是一个有效的途径，以消除供应限制。表面更新也被发现是重要的跳跃轰击的效率。我们表明，表面更新是一个重要的机制，影响粉尘排放，并建议将这种机制包括在未来的粉尘模型。
Abstract. Wind tunnel experiments of dust emissions from different soil surfaces are carried out to better understand dust emission mechanisms. The effects of surface renewal on aerodynamic entrainment and saltation bombardment are analyzed in detail. It is found that flow conditions, surface particle motions (saltation and creep), soil dust content and ground obstacles all strongly affect dust emission, causing its rate to vary over orders of magnitude. Aerodynamic entrainment is highly effective, if dust supply is unlimited, as in the first 2–3 min of our wind tunnel runs. While aerodynamic entrainment is suppressed by dust supply limits, surface renewal through the motion of surface particles appears to be an effective pathway to remove the supply limit. Surface renewal is also found to be important to the efficiency of saltation bombardment. We demonstrate that surface renewal is a significant mechanism affecting dust emission and recommend that this mechanism be included in future dust models.