Study on tribocharging of CaCO3 particles based on CFD-DEM gas-solid two-phase flow coupling.

Unsuccessful prediction of particle tribocharging in tribocharger is partly due to the complexity of tribocharging process. In this work, computational fluid dynamics-discrete element method (CFD-DEM) modeling approach has been used to investigate particle charge in a cyclone tribocharger. Then particle image velocimetry (PIV) method is used to calculate the particle charge-to-mass ratio. The CaCO 3 particle charge in a cyclone tribocharger is simulated and predicted under different gas velocities, particle sizes and moving distances. The simulation results carry out the quantitative and qualitative relationship between different parameters. At the same time, the charge-to-mass ratio between the particle simulation and the experimental results under different gas velocities is compared, and the results are all in the magnitude of 10−4. Experimental results in terms of particle charge-to-mass ratio are thus obtained. The CFD-DEM model is verified by comparison with the experimental results [Display omitted] • CFD-DEM gas-solid two-phase flow coupling method is used to predict particle charge. • Insight the particle tribocharging under different particle sizes, airflow rates and moving distances is investigated. • Resolve the mechanism of particle tribocharge in a cyclone tribocharger. • Experimental results verify the accuracy of the simulation under the same condition. [ABSTRACT FROM AUTHOR]