化学工程2011，Vol.39Issue(9)：41-46,6.
错位六弯叶桨在假塑性流体中的混沌搅拌特性
Chaotic agitation characteristics of shifted 6-bent-blade impeller in pseudoplastic fluid
栾德玉 1周慎杰 2陈颂英 1楚树坡1
作者信息
- 1. 山东大学机械工程学院,山东济南250061
- 2. 青岛科技大学机电工程学院,山东青岛266061
- 折叠
摘要
Abstract
Based on the chaotic mixing theory, a novel impeller with shifted 6-bent-blade was proposed for destroying the mixed isolation region of laminar flow field. Computational fluid dynamics ( CFD) method was applied to the study of 3D flow field driven by a 6-bent-blade turbine (6BT) and a shifted 6-bent-blade turbine (6SBT) respectively in the agitation of xanthan gum. The flow pattern, mean velocity distribution and power consumption in stirred tank with two different impellers were extensively analyzed and compared. The results show that the values of numerical simulation and the experimental measurement of power consumption are in good agreement, and the critical Reynolds number of 6SBT in laminar flow is 20. The asymmetric structure in flow field of 6SBT can destroy mixed isolation region, and enlarge the stirring range. The improvement effect of laminar flow field performance strengthens, the average shear rate increases, and it has energy-saving effect as Reynolds number increases. The radial and axial velocity distributions of 6SBT are clearly superior to those of 6BT at agitation speed of 5 r/s, while the power consumption is about 93% of that in 6BT agitation.关键词
假塑性流体/错位六弯叶桨/隔离区/层流模型Key words
pseudoplastic fluid/ shifted 6-bent-blade turbine/ isolation region/ laminar flow model分类
化学化工引用本文复制引用
栾德玉,周慎杰,陈颂英,楚树坡..错位六弯叶桨在假塑性流体中的混沌搅拌特性[J].化学工程,2011,39(9):41-46,6.
