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《中国化学工程学报(英文版)》 2008-05
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Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

ZHANG Minge 1 ,ZHANG Lühong 1,JIANG Bin 1,2 ,YIN Yuguo 1and LI Xingang 1,2 1 School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China 2National Engineering Research Centre of Distillation Technology,Tianjin 300072,China  
Using the multiple reference frames(MRF)impeller method,the three-dimensional non-Newtonian flow field generated by a double helical ribbon(DHR)impeller has been simulated.The velocity field calculated by the numerical simulation was similar to the previous studies and the power constant agreed well with the experi- mental data.Three computational fluid dynamic(CFD)methods,labeled I,II and III,were used to compute the Metzner constant ks.The results showed that the calculated value from the slop method(method I)was consistent with the experimental data.Method II,which took the maximal circumference-average shear rate around the impel- ler as the effective shear rate to compute ks,also showed good agreement with the experiment.However,both methods suffer from the complexity of calculation procedures.A new method(method III)was devised in this paper to use the area-weighted average viscosity around the impeller as the effective viscosity for calculating ks.Method III showed both good accuracy and ease of use.
【Fund】: the Natural Science Foundation of Tianjin(07JCZDJC02600).
【CateGory Index】: TP391.9
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