Mineral dust resuspension under vibration: Onset conditions and the role of humidity  

作　　者：F.J.Balladore J.G.Benito R.O.Unac A.M.Vidales 

机构地区：[1]Departamento de Mineria,Facultad de Ciencias Fisico Matematicas y Naturales,Universidad Nacional de San Luis,Chacabuco 917,D5700HHW,San Luis,Argentina [2]INFAP,CONICET,Departamento de Fisica,Facultad de Ciencias Fisico Matematicas y Naturales,Universidad Nacional de San Luis,Ejercito de los Andes 950,D5700HHW,San Luis,Argentina

出　　处：《Particuology》2020年第3期112-119,共8页颗粒学报（英文版）

基　　金：the Universidad Nacional de San Luis(grant 03-2718);National Scientific and Technical Research Council of Argentina(CONICET).

摘　　要：The vibration of dusty surfaces inevitably causes re-entrainment of particles into the atmosphere.Given that movement of mineral dust particles deposited on a surface begins at a critical frequency (fc) and amplitude,an experimental laboratory study was conducted to determine the onset conditions for resuspension of a vibrated granular soil.We determined the resuspension state diagram as a function of frequency and amplitude of a sinusoidal vibration,the granulometry of the dust and the thickness of the soil bed.The mitigation effect of humidity was also evaluated.Critical frequencies ranged between 2.5 and 23 Hz when amplitudes were less than 12 rmm.These results were independent of bed thickness and perturbation type.For all particle sizes observed,fc decreased monotonically with A,contrasting with behavior observed for individual particles.In dry samples,fe for large size classes was markedly less when A was greater than 6 mm;while thefc for fine fractions only decreased once amplitudes reached 10 mm.Experiments with wet granular soils demonstrated that wetting above an optimum humidity did not necessarily impede movement and caused agglomeration.This study provides guidelines for managing resuspension of granular soils subjected to vibrations.

关 键 词：RESUSPENSION VIBRATION Granular soil Mineral dust Critical frequency Humidity 

分 类 号：TV14[水利工程—水力学及河流动力学]