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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Vertical dispersion of dust particles in a turbulent boundary layer
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Vertical dispersion of dust particles in a turbulent boundary layer

机译：灰尘颗粒在湍流边界层中的垂直分散

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The flow of glass dust particles in air was investigated experimentally over a flat bed in a wind tunnel. Particle concentrations were measured by light scattering diffusion (LSD) and digital image processing. It was verified that saltation is the main mechanism for ejection of dust particles. Vertical mean dust concentrations for 'pure dust' and two mixtures of dust and saltating glass particles were determined and analysed. The experiments confirmed that for the 'pure dust' configuration the mean concentration decreases as a power function with height. For the mixture configurations and for free stream velocities close to the threshold velocity, the mean concentration also decreases in a power function. For higher velocities, mean concentration decreases respectively as a power function or exponential function for large and small ratios of the dust:saltating particles respectively. The exponent of the power law reflects the dust:particle ratio and the free stream flow velocity. Copyright (C) 2007 John Wiley & Sons, Ltd.
机译：实验研究了风道中平板玻璃在空气中的流动。颗粒浓度通过光散射扩散（LSD）和数字图像处理进行测量。事实证明，盐析是喷出粉尘颗粒的主要机制。确定并分析了“纯尘”和粉尘与盐分化玻璃颗粒的两种混合物的垂直平均粉尘浓度。实验证实，对于“纯尘”配置，平均浓度随高度的幂函数而降低。对于混合物构造和对于接近阈值速度的自由流速度，平均浓度在幂函数中也降低。对于较高的速度，分别针对大，小比例的尘埃：盐分颗粒，平均浓度分别作为幂函数或指数函数降低。幂律的指数反映了粉尘：颗粒比和自由流的流速。版权所有（C）2007 John Wiley＆Sons，Ltd.

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