Eulerian-Lagrangian simulation of non-isothermal particle-laden flow

Direct numerical simulations of particle-laden channel flow with walls kept at different temperatures are performed. The position, velocity and temperature of each particle are computed in time with a Lagrangian approach, with a two-way coupling between particles and carrier flow in the heat and momentum equations. The focus of this study is on the effect of direct particle-to-wall heat conduction for wall-colliding particles. A model based on Hertzian contact is implemented in the in-house Eulerian-Lagrangian solver. It is shown that for smooth walls (with a very thin layer of fluid between the particles and wall during collision), and metallic particles, the particle-to-wall heat conduction is not negligible, and it can even be comparable with the convective fluid-to-wall heat transfer. The results are presented in terms of different average wall roughness and particle mass loadings.