Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
EULER-LAGRANGE APPROACH OF DUST EMISSION AND DISPERSION FROM STOCKPILES OF GRANULAR MATERIALS
Submission Author:
Bruno Furieri , ES
Co-Authors:
Edilson Luiz do Nascimento, Neyval Reis, jane meri Santos, Enilene Lovatte, Maria Clara Schuwartz Ferreira
Presenter: Bruno Furieri
doi://10.26678/ABCM.ENCIT2016.CIT2016-0187
Abstract
The present work studies the dispersion of silt particles using the Euler-Lagrange approach. The main results are focused on instantaneous three-dimensional fields of particle location and concentration over the domain and on the ground surface surrounding the source. We analyse more finely the turbulence structure on and surrounding the stockpile to easily understand the take-off and dispersion process. The present work focuses on the investigation of particles behaviour emitted by aeolian erosion of stockpiles of granular materials. The Eulerian approach simulates the fluid phase (wind flow) by means of Large Eddy Simulations (LES) to incorporate the effects of atmospheric turbulence. The Lagrangian approach simulates the unsteady particle tracking for the discrete phase (granular materials). The numerical results well reproduced the mean velocity profile, while the turbulence intensity accounted for differences of 2% or less compared to the experimental results. The Euler-Lagrange approach presented very interesting results about particles behavior downstream the pile. Some profiles helped to explain the zones of higher and lower concentration downstream the pile. High concentration values of granular material particles were found parallel to the highest friction zone on the ground near the pile. It was found that concentrations were in the range 1.10-4 g/cm3 to 6.10-4 g/cm3 throughout the study area, consistent with the range of the experimental order of magnitude in the bed of particles found in literature.
Keywords
dust emission, atmospheric dispersion, LES, Euler-Lagrange, stockpiles
