Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
TEMPORAL EVOLUTION OF SUSPENTION POTENTIAL AROUND SUCCESSIVE STOCKPILES USING THE OIL-FILM TECHNIQUE
Submission Author:
Cristina Lima de Morais , ES
Co-Authors:
Bruno Furieri, jane meri Santos, Jean-Luc Harion
Presenter: Cristina Lima de Morais
doi://10.26678/ABCM.COBEM2023.COB2023-2397
Abstract
Open industrial yards are used to store large amounts of granular material such as coal, iron ore and limestone, for instance. Due the erosion caused by wind, these materials can be emitted to the atmosphere offering risks to the environment and to the human health. To select dust control techniques and comply with environmental polices requirements, it is important to understand the disturbance to atmospheric flow caused by the presence of the stockpiles and to estimate the particles emission to the atmosphere due to wind erosion. There are several studies on particles emission from stockpiles surfaces, but only few studies considering the emission that may occur from the regions that surround the stockpiles. In these regions, emission can occur from ground soil or can be originated from the transport of material within the industrial site as from the erosion of the stockpiles, charactering a re-emission event. The present work aims to investigate the temporal evolution of the resuspension potential around successive stockpiles using the oil- film technique. Laboratory experimental simulations of the wind flow over two successive wood stockpiles models oriented 30°, 60° and 90° to the incoming flow were performed. Photographs were taken during the experiment and the temporal evolution of the shear stress patterns on the ground surface were evaluated. The results show that the regions on the ground surface surrounding the two piles oriented at 90° presented lower levels of shear stress whilst the same regions surrounding the two piles oriented at 60° gave higher levels of shear stress. Regions on the ground surface around the two piles oriented at 30° to the incoming flow represent the intermediate case among those studied regarding the level of shear stress. Furthermore, the regions around piles oriented at 30 and 60° reach the final stage of the oil-film pattern modification faster, indicating that the stockpiles orientation (or wind direction) has a strong influence on the erosion potential.
Keywords
Wind erosion, Particulate Matter, stockpiles, Oil-film technique
