Simulation of solid-liquid two-phase turbulent flow in double-channel pump based on Mixture model

To further study the solid-liquid two-phase flow mechanism in double-channel pump, three-dimensional simulation was performed for the solid-liquid two-phase turbulent flow in double-channel pump by using Fluent software with mixture model, extended SIMPLEC algorithm and standard k-ε turbulence model. The calculation results were compared with the computational results of single-phase simulation, as well as the experimental data. It is concluded that: in channels of impeller, the volume fraction contour is extremely nonuniform, solid particles mainly accumulate on pressure surface of impeller, but tend towards suction side at the condition of low sandy volume fraction and small particle diameter; in channels of volute, solid particles are mainly concentrated in the channel near the exit of volute, few solid particles can directly flow out of the volute, and a large number of solid particles collide with volute wall and exit the volute after circling around the volute for several times; sandy volume fraction has less influence on distribution of volume fraction compared to solid particle diameter; inlet and outlet total pressure difference declines with the increase of sandy volume fraction or particle diameter.