Key Words:Porous fence; Deflectors; Shelter effect; Standard k-epsilon turbulence model; Triangular prism
Abstract:This paper introduces a new type of wind fence-the deflector-porous fence. The deflectors were bent to a fixed inclination with the fence plate. And they are left attached on the lower edge of the fence holes. Our purpose is to weaken the bleed flow effect on the windward surface of the stockpiles and enhance the shelter efficiency of porous fences. A three-dimensional numerical model was performed to simulate the flow field around a triangular-shaped prism model behind the deflector-porous fence by solving Reynolds-average Navier-Stokes (RANS) equations with standard k-epsilon turbulence closure model. Data obtained from CFD simulations were then integrated to determine the best structural parameters of the new wind fence. The shelter effect of deflector-porous fence was estimated by comparing with that of the traditional wind fence. The validity of the numerical results has been evaluated by comparing with the wind-tunnel experimental data. As a result, the numerical predictions show good agreement with the wind tunnel results. The simulation results show that the deflector-porous fence with porosity (phi) of 30%, height (H) of 150 mm and the location (G) of 150 mm seems to be most effective in controlling the dust emission. It is suggested that the stockpile behind the deflector-porous fence is much safer than that behind the traditional wind fence (the fence with square or circular holes). (C) 2012 Elsevier B.V. All rights reserved.
Volume:230
Translation or Not:no