PR-DNS on the momentum and heat transfer of a rotating ellipsoidal particle in a fluid

Abstract

Particle resolved direct numerical simulations (PR-DNS) are conducted to study the forced convection process of a cold flow passing over a rotating hot ellipsoidal particle. The numerical model is firstly verified against previously published data on both stationary and rotating particles. Then, one hundred case studies are carried out by changing five particle aspect ratios, five Reynolds numbers and four particle spin numbers, respectively. The effects of particle rotation on drag coefficient (Cd), lift coefficient (Cl), moment coefficient (Cm) and average Nusselt number (Nu) are investigated in detail. The changing trends of Cd, Cl, Cm and Nu with the particle incident angle in different cases are comprehensively analysed and compared. Numerical results of a rotating non-spherical particle show quite interesting and different phenomena compared with the stationary case. It is indicated that the particle rotation must be considered when evaluating the momentum and heat transfer between non-spherical particles and fluids. The findings provide important evidence to properly evaluate the role of particle rotation in the macro-scale modelling of multiphase flows.