Numerical investigation to reduce environmental emissions from manufacturing industries

This paper aims to study carbon dioxide emissions from the cement manufacturing under wind conditions. These effects are investigated by Computational Fluid Dynamics (CFD) code used both method such as a Large Eddy Simulation (LES) and K-ε methods to investigate a spread of pollution in vicinity of manufacturing. The predicted concentration, velocity and temperature of CO2 were used as the safety criterion to provide the useful information about a pollution amount resulted under variant environmental and structural conditions. A detailed look at results is beyond the scope of analysis to determine optimal CO2 emission. From the present numerical simulation the carbon dioxide appears to be the best candidate as tracer gas and Simulation (LES) methods, which directly calculate the large-scale turbulent structures and reserve modeling offer the best analysis of turbulent flows

Design and Construction Criteria of Twin Tunnel: Taking an Adverse Wind Condition Effects on Air Pollution Short Circuit at Tunnel Portals as a case

This paper aims to study the influence of the tunnel portal designs, wind conditions and ventilation rate on the amount of air pollution short circuit from one tunnel tube to the other. These effects are investigated by Computational Fluid Dynamics (CFD) code used a Large Eddy Simulation (LES) method to control air quality inside the tunnel and reduced as far as possible a short circuited (flow Recirculation) flow level. A validation of CFD code to experimental data in 1:100 scale model of the road traffic tunnel tested in wind-tunnel showed that the CFD gave satisfactory prediction of the air pollution short circuit in the vicinity of tunnel portal. The predicted concentration of the gas tracer (CO2) used as the safety criterion provide the useful information about a short circuit amount resulted for each structural variant of tunnel portals, such as a central dividing wall built as extensions from the end of road tunnel and offset tunnel portal entrance exit tested under different speed ratio of wind and ventilation. A detailed look at results is beyond the scope of analysis to determine optimal air pollution short circuit percentages. Finally, the perfect tunnel portals geometry can be suggested