A Kind Of Charging Mechanism Of Sand Particles

Charges carried by moving sand particles influence the measurement error of instruments used in wind sand environmental observation, and also influence the propagation of electromagnetic wave in the sand storm. These effects depend on the charge polarity and the magnitude of the charge. The charging mechanism of sand particles is the key to understand the moving sand particle how to charged, and further quantitatively calculate the magnitude of charge carried by a single sand particle.In this thesis, we focus on the charging mechanism of sand particle. Considering the soil property of sand, a kind of charging mechanism is presented. Firstly, we conduct out experiments to measure the surface charge of the sand particle. Based on theses measurement data, we derive the charge of the sand particles. which lift off sand bed. And then a charging model of sand particle is presented assuming that the sand bed is a parallel plate capacitor. Finally we discuss the effect of relative humidity, aeolian elector field and the electro resistant rate of the sand bed.