Experiments and numerical modeling for the movement and resuspension of grains

VALENZUELA ARACENA, KARINA A.; BENITO, JESICA G.; OGER, LUC; UÑAC, RODOLFO O.; IPPOLITO, IRENE; VIDALES, ANA M.

EPJ Web of Conferences

EDP Sicence

Año: 2017 vol. 140

We discuss two typical problems involved in particle resuspension phenomena. First, we analyzethe onset of movement of a grain deposited on a surface prior to its possible resuspension. In this case, welook for the critical frequency and amplitude needed for starting the movement of the grain when thesurface is perturbed by a sinusoidal vertical vibration. We compare results coming from our ownexperiments and DEM simulations. The agreement is good and allows evaluating the effect of the relativesize of the grain on the initiation of movement. The second problem refers to the resuspension of grains,also deposited on a monolayer surface without interactions between them, due to the effect of aerodynamicforces. The detachment of grains as the wind intensity increases is studied through Monte Carlo simulationsand the results are compared with experiments belonging to other authors. The role of the particle rollingmechanisms and the reduction factor due to roughness are discussed. Comparison of numerical andexperimental data is promising.