Abstract：The numerical simulation of single-phase turbulent flow behaviors such as velocity magnitude, velocity gradients, shear stress, turbulence intensity and turbulent transmission in an impeller stirred media mill at different shaft speeds was carried out by computational fluid dynamics. The fluid velocities of single-phase flow (water) in stirred mill grinding chamber were measured. The results indicate that the flow between the rotor discs relates to whirlpool and randomness due to the enhanced flow dispersion. The local energy dissipation is non-uniform because the energy dissipation occurs in a small zone around the discs and the wall, where the effective grinding occurs. The fluid shear stress increases linearly with velocity gradient of the flow. In a certain range, the flow velocity and the gradient both increase while increasing the shaft speed. The fluid velocities measured by Pitot tube are consistent to the simulated results. The difference between the simulated and experimental data is slight enough to show that the method could be used for simulation purpose.

Keywords：stirred media mill; numerical simulation; single-phase flow; velocity gradient; energy