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- W2005403456 abstract "This article presents a measurement of electrification generated by wind‐blown sands in a field wind tunnel and a numerical methodology to simulate the effect of electrification on the sand saltation movement after the mutual couple interaction between the sand movement and the wind flow is taken into account. The measured data of electric charge on the “uniform” sands in the wind‐tunnel tests show that the sign of electric charge, either negative or positive, is mainly dependent on the diameter size of sand particles, i.e., negative charge is gained when the diameter is smaller than 250 μm and positive charge is obtained if the diameter is larger than 500 μm, and that for both “uniform” and mixed sands, the average charge‐to‐mass ratio decreases with increasing the wind velocity, and increases with height from sand bed. Meanwhile, the measurement of electric field in wind‐sand cloud related to the electric charge displays that the magnitude of electric field increases generally as the wind velocity and the height increase, and the direction of the field is always upwardly vertical to the Earth's surface, which is opposite to that of the fair‐weather field. In order to exhibit the effect of electrification on sand saltation movement, a theoretical model by considering the mutual coupling interaction between wind flow and sand movement is proposed after the electric force exerted on the moving sands is considered. Through solving the nonlinear coupling dynamic equations by a proposed program, the effect of electrification on sand saltation motion, e.g., trajectory, is discussed quantitatively. After that, its effect on wind‐sand transport flux, sand ejecta flux, and wind profile is also displayed. The results show that the prediction for the Bagnold's kink is good agreement with the measurement in literature." @default.
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- W2005403456 date "2003-05-27" @default.
- W2005403456 modified "2023-10-15" @default.
- W2005403456 title "Laboratory measurement of electrification of wind-blown sands and simulation of its effect on sand saltation movement" @default.
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- W2005403456 doi "https://doi.org/10.1029/2002jd002572" @default.
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