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The effect of turbulent motions on the transport of dust and heat in the development stage of dust storms induced by cold front
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2021-03-27 , DOI: 10.1016/j.jweia.2021.104604
Tian-Li Bo

The observation data in the development stage of dust storms induced by cold front were analyzed. The results showed that the contribution of outward and inward interaction to dust and heat transport were less than that of ejection and sweep events. That is, the transportation of dust and heat was not dominated by interactions. In the ejection events, the low- and high-frequency fluctuations dominate the upward transportation of high- and low-concentration dust micro-elements and cold air, respectively. In the sweep events, the low- and high-frequency fluctuations dominate the downward transportation of low- and high-concentration dust micro-elements and hot air. For dust transportation, although the flux directions of the low- and high-frequency fluctuations are opposite, the flux contribution of the low-frequency fluctuation is larger than that of the high-frequency fluctuation. Therefore, directions of dust transportation during dust storms are towards the second-quadrant direction. For heat transport, since the directions of the heat flux of low- and high-frequency fluctuations are the same, the direction of heat transport is towards the fourth quadrant direction.



中文翻译:

在冷锋诱发的沙尘暴发展阶段,湍流运动对尘埃和热的传递的影响

分析了冷锋诱发的沙尘暴发展阶段的观测资料。结果表明,向外和向内相互作用对尘埃和热传递的贡献小于喷射和吹扫事件。也就是说,尘埃和热量的传输不受相互作用的支配。在喷射事件中,低频和高频波动分别控制着高浓度和低浓度粉尘微量元素和冷空气的向上传输。在清扫事件中,低频和高频波动主导着低浓度和高浓度灰尘微元素和热空气的向下传输。对于粉尘运输,尽管低频和高频波动的通量方向相反,低频波动的通量贡献大于高频波动的通量贡献。因此,沙尘暴期间的粉尘输送方向朝第二象限方向。对于热传输,由于低频和高频波动的热通量方向相同,因此热传输方向朝向第四象限方向。

更新日期:2021-03-27
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