Turbulent Mixing and Scale-Up of Ejectors at High Schmidt Number
Micro- and Macro-mixing models were built and numerical investigation of turbulent mixing in ejectors was carried out. Mixture fraction and its variance presented by Fox were remodeled to demonstrate micro- and macro-mixing performance. The length needed to reach 98% micro- and macro-mixing were founded is functions of uj/um and D/d. The mathematical scale-up models were presented based on the simulation results using least square method for micro- and macro-mixing and five different cases were used to validate the models. The results showed that macro-mixing scale-up model agreed well with CFD simulations but the micro-mixing scale-up model had a less precision compared with that of macro-mixing model. This because that the mechanism of micro-mixing process is very complexity but the CFD models we used in this work are fairy simple.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
L. X. Ma et al., "Turbulent Mixing and Scale-Up of Ejectors at High Schmidt Number", Advanced Materials Research, Vols. 233-235, pp. 1340-1344, 2011