EFFECT OF ELECTROSTATIC FORCE ON SPATIAL DISTRIBUTION AND INTERPHASE ENERGY TRANSPORT IN RADIANT HEATED PARTICLE-LADEN TURBULENT CHANNEL FLOW

Interphase energy transfer in turbulence laden with particles is one of the focuses of scholars, and the effect of electrostatic force is an important factor affecting the particles propensity distribution and the efficiency of energy exchange between particles and turbulence in the turbulent channel flow laden with particles. In this paper, the spatial distribution of charged particles in vertical turbulent channel flow with radiation heating and the effect of spatial distribution on the energy transport between particles and turbulent flow were investigated. Direct numerical simulation was used for fluid, and Lagrange-point tracking model was used for particles. The momentum exchange and the heat exchange between particles and turbulent flow were considered. Based on the analysis of particle local aggregation characteristics, velocity correlation between particles and turbulent flow and interphase energy transport, the effect of electrostatic force on particle spatial distribution, kinetic energy exchange and heat exchange between particles and fluid were investigated. The results show that the electrostatic force of the same positive charged particles leads to the weak aggregation of particles in the low speed band area near the two wall, and the spatial distribution of particles is more uniform, which is positively correlated with the amount of charge carried by particles. At the same time, it is found that the electrostatic force attenuates the followability of particles to the fluid in the near wall region, and the electrostatic force is superior to the Stokes drag. Meanwhile, the uniform distribution of particles in the vertical channel improves the mean temperature of fluid and the mean streamwise velocity of the fluid. And it strengthens the kinetic energy exchange and the heat exchange between particles and fluid in the middle area of the vertical channel while weakens the kinetic energy exchange and the heat exchange between particles and turbulent flow near the wall.