Solutions of the time‐averaged equations of motion with a nonisotropic k‐e model were developed for the three‐dimensional turbulent flow field in turbine stirred tanks. These results were validated with the measurements of three velocity components with a hot wire anemometer and literature data. The nonisotropic turbulence model considered the rotation and curvature effect of the turbulence with a turbulent Richardson number term and accounted for the important three‐dimensional effects through the nonisotropy of the viscosity. Also, it was found that a frequently used isotropic k‐ϵ turbulence model did not describe this three‐dimensional turbulent flow field.

No abstract

No abstract

No abstract

The effects of process parameters on the performance of the INER process for recovery of uranium from wet-process phosphoric acid were studied via pseudo dynamic simulation technique. The process parameters investigated include the organic-to-aqueous flow ratio, the aqueous feed-tostripping agent flow ratio, stage configuration and flow arrangement. The flow arrangements concerned include countercurrent, crosscurrent, and alternating extraction and stripping. The calculated results are in good agreement with the pilot plant data. An improvement of the process performance based on simulation results was also proposed.