Lattice Boltzmann Simulation of Two-Dimensional Buoyant Impinging Streams with the Soret and Dufour Effects

Impinging streams is the flow form in the gastifier of entrained-flow coal gasification, which has the vital practical significance to greatly increase the utilization efficiency of coal and dramatically reduce the pollution originating from coal. The impinging streams is typically dense gas-particle turbulent flows with heat and mass transfer and chemical reaction under high temperature and pressure. In this work, the regularized lattice Boltzmann model is used to investigate the buoyancy-driven impinging streams with the Soret and Dufour effects. Under the Soret and Dufour effects, the influences of configuration parameters (H/W, H and W are the jets’ separation and jet inlet width), Reynolds number (Re), buoyancy ratio, Prandt number (Pr), Schmidt number (Sc) on the structures of flow, temperature and concentration fields are studied. The effects of Soret number (Sr) and Dufour number (Df) on the variation of average Nusselt number and Sherwood number on the walls are also investigated.