Turbulent mixing in a three-phase fluid bed

Summary

Our study on longitudinal and radial mixing in the liquid phase of a three-phase fluid bed shows that:

• 1) the concentration profile of the indicator in the observation zone approximately satisfies a logarithmic law;

• 2) acceleration of the gas velocity intensifies longitudinal mixing;

• 3) acceleration of the liquid velocity reduces the effect of longitudinal mixing

• 4) the presence of a dispersed solid phase depresses the effect of longitudinal mixing;

• 5) a rise of the kinetic energy of the flows entering the working zone of the reactor model promotes longitudinal mixing, but the increase in the length of longitudinal mixing is not proportional to the velocity of the current;

• 6) the concentration profile of the indicator in a cross section through the three-phase bed becomes less uniform with increasing discharge rate of the liquid, and more uniform with increasing discharge rate of the gas;

• 7) the concentration profile of the indicator in a cross section through the three-phase fluid bed becomes more uniform when the free cross sectional area of the grate is increased.