Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

作     者：张敏革 张吕鸿 姜斌 尹玉国 李鑫钢 ZHANG Minge;ZHANG Lühong;JIANG Bin;YIN Yuguo;LI Xingang

作者机构：School Of Chemical Engineenng and Technology Tianjin University Tianjin 300072 China National Engineering Research Centre of Distillation Technology Tianjin 300072 China 

基　　金：Supported by the Natural Science Foundation of Tianjin (07JCZDJC02600) 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2008年第16卷第5期

页      码：686-692页

摘      要：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 experimental data. Three computational fluid dynamic （CFD） methods, labeled Ⅰ, Ⅱ and Ⅲ, were used to compute the Metzuer constant k5. 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 impeller 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 k5. Method Ⅲ showed both good accuracy and ease of use.

主 题 词：computational fluid dynamic double helical ribbon impeller non-Newtonian fluid Metzner constant 

学科分类：07[理学] 0703[理学-化学类] 

核心收录：

D　O　I：10.1016/S1004-9541(08)60141-X

馆 藏 号：203861612...