化学工程Issue(3)：39-43,5.DOI:10.3969/j.issn.1005-9954.2014.03.008
双层桨搅拌假塑性流体混合特性的数值模拟
Numerical simulation on mixing characteristics of pseudoplastic fluid in dual-impeller stirred tank
摘要
Abstract
The mixing characteristics in a transparent tank with diameter of 0.21 m and flat bottom stirred by different dual impeller combinations,i.e.,perturbed six-bent-bladed turbine(6PBT)+three-pitched-bladed turbine and six-bent-bladed turbine (6BT) +three-pitched-bladed turbine,were investigated respectively.The computational fluid dynamics (CFD)technique was adopted to solve the problems numerically and the test fluids used were shear thinning fluids,1.0% and 1.5% (mass fraction)xanthan gum solution.The influences of layer clearance on flow field construction and different combinations on mixing process were investigated.The proper layer clearance was determined under different speeds.Perturbed six-bent-bladed turbine combination was applied to the trial-production stirring process of FCC catalyst gum formation on-the-spot.The results show that it has characteristics of the connected flow with 6PBT combination in the laminar regime when the layer clearance is equal to T/3,while the layer clearance T/2 is suitable in transitional flow region.6PBT combination has a major superiority on mixing rate and mixing efficiency to 6BT one with the low mixing time number and mixing energy.The wearability of catalyst particle was greatly improved with the increase of particle wear index from 2.6 to 1.9.The product reaches the high quality with a clear effect of saving energy 15%.So 6PBT combination is worth of application and dissemination.关键词
双层桨/混合特性/假塑性流体/层间距Key words
dual-impeller combination/mixing characteristics/pseudoplastic fluid/layer clearance分类
化学化工引用本文复制引用
栾德玉,段虎,周慎杰,陈颂英..双层桨搅拌假塑性流体混合特性的数值模拟[J].化学工程,2014,(3):39-43,5.基金项目
青岛科技大学科研启动基金资助项目 （）
