Investigating the Advantages and Limitations of Modeling Physical Mass Transfer of CO2 on Flat Plate by One Fluid Formulation in OpenFOAM

One fluid formulation is an approach used for modeling and analysis of mass transfer between two immiscible phases. In this study we implement and analyze the advantages and limitations of this approach for CO2 physical mass transfer into MEA. The domain is a flat plate and gas liquid flow is counter current. The analysis was carried for operating parameters like liquid phase Reynolds number, MEA mass fraction and the angle of inclination of flat plate. The results clearly show that the model effectively captures the deviation in liquid side mass transfer coefficient due to the surface instabilities and liquid properties which are generally neglected by standard correlations. Also the model shows that the standard Higbie correlation is preferable at low Reynolds number at any angle of inclination. The grid independent studies show that a size of 6.25 µm is required in the interface region for effectively using this approach. The computational resource time at this resolution was found as the only limitation for using this approach and we suggest a procedure to overcome this limitation. The present simulation results can help CFD researchers investigating immiscible gas-liquid mass transfer using OpenFOAM

Electrochemical treatment of wastewaters from poultry slaughtering and processing by using iron electrodes

Poultry slaughterhouse wastewater (PSWW) originating from slaughterhouse and meat processing contains high concentrations of organic substances. Discharging this kind of wastewater to a river, sewer system or soil causes a severe pollution problem for receiving body. The aim of this study was to investigate the treatability of poultry slaughterhouse wastewater using electrocoagulation method. The reactor had a cylindrical iron shell with three separate iron rods mounted vertically inside that to work as cathode and anode respectively. The effects of the current density, supporting electrolyte (Na2SO4) dosage, wastewater flow rate, initial pH and the polyelectrolyte material were evaluated in a continuous flow mode. The peroxy-electrocoagulation was also investigated by addition of H2O2 with different concentrations to reach higher removal efficiencies. When the poultry slaughter wastewater was subjected to the peroxy-electrocoagulation, chemical oxygen demand (COD) decreased to 425 mg L-1 from 8800 mg L-1 which corresponds to 95.48% of removal efficiency with an operation cost of $9 per m(3) of wastewater treated. (C) 2017 Elsevier Ltd. All rights reserved