Abstract: The flow field of liquid phase (water) of agitated extraction columns is simulated with the
help ofcomputational fluid dynamics (CFD). Four kinds of Reynolds-averaged turbulence
models, i.e. the standard k-εmodel, the RNG (renormalization group) k-ε model, the
realizable k-ε model and the Reynolds stress model, arecompared in detail in order to
judge which is the best model in terms of the accuracy, less CPU time and memoryrequired.
The performance of the realizable k-ε model is obviously improved by reducing the model
constant fromc2 ＝ 1.90 to c2 ＝ 1.61. It is concluded that the improved realizable k-ε
model is the optimal model.

Key words: agitated extraction column, turbulence models, computational fluid dynamics

摘要： The flow field of liquid phase (water) of agitated extraction columns is simulated with the
help ofcomputational fluid dynamics (CFD). Four kinds of Reynolds-averaged turbulence
models, i.e. the standard k-εmodel, the RNG (renormalization group) k-ε model, the
realizable k-ε model and the Reynolds stress model, arecompared in detail in order to
judge which is the best model in terms of the accuracy, less CPU time and memoryrequired.
The performance of the realizable k-ε model is obviously improved by reducing the model
constant fromc2 ＝ 1.90 to c2 ＝ 1.61. It is concluded that the improved realizable k-ε
model is the optimal model.

关键词: agitated extraction column;turbulence models;computational fluid dynamics