Numerical Investigation of AdBlue Droplet Evaporation and Thermal Decomposition in the Context of NOx-SCR Using a Multi-Component Evaporation Model

摘要: To cope with the progressive tightening of emission regulations, gasoline and diesel engines will continuously require highly improved exhaust after-treatment systems. In case engines, selective catalytic reduction (SCR) appears as one widely adopted technologies to reduce NOx (nitrogen oxides) emissions. Thereby, help available heat from gas, injected urea–water solution (UWS) turns inside port immediately into gaseous ammonia (NH3) by evaporation mixture thermal decomposition urea. The reaction conversion efficiency mostly depend upon subsequent mixing NH3 which in turn depends engine loading conditions. Up now, aggregation urea after water during is not clearly understood. Hence, various scenarios for depletion phase that can be envisaged have appraised under SCR operating conditions relying on an appropriate description. objective present paper therefore fourfold. First, a reliable multi-component model includes proper binary diffusion coefficient developed first time Euler–Lagrangian CFD (computational fluid dynamics) framework account properly distinct regimes adBlue droplets Second, this extended phase, where, depending how provided, different are considered. Third, since at around droplet surface based gas film approach, material properties evaluated influences process results reported, also time. Finally, impact ambient temperatures characteristics well effect gravity pointed out. prediction capability variants assessed comparing achieved each other experimental data. It out satisfactory agreement between experiment numerical predictions wide range using correlations “Wilke Lee” “Fuller et al.” water. essentially sensitive gravity. From comparisons ways urea, significant difference observed. 1/3 rule used evaluating shows accurate both