Abstract: Based on the independent validation on mesh quality， the single phase flow field of a lab-scale deep-cone thickener with 4 L capacity was numerically simulated by using the turbulence model of Reynolds stress. The influence of the feed flow rate on the characteristics of velocity， shear and turbulence intensity was systemically investigated. The numerical results showed that the velocity field of the thickener distributes symmetrically along the shaft. The up-down circuit flow is formed in the axial direction. The counterflow and discharging flow is formed in radial direction. The axial velocity increases by about 0.02m·s^-1 with every 1.8L/min increase rate of feed flow. The shear intensity in the feedwell is higher than that in any other region of the thickener， and takes on positive correlation to the feed flow rate.The region of high turbulence intensity distributes at the edge of the shelf as well as in the contractile region of the feedwell. A feed flow rate of 1.8L/min in this case presents better dissipation performance of turbulence kinetic energy. The feed flow rate has little effect on the reflux ratio of the feedwell with a deflector.

Key words: deep-cone thickener, flow field characteristics, numerical simulation, feed flow rate, shear intensity