化工学报Issue(2)：448-457,10.DOI:10.11949/j.issn.0438-1157.20151143
放大准则对混合澄清槽混合室中混合时间和流动特性的影响
Mixing time and flow characteristic in square pump-mix mixer under different scale-up criteria
摘要
Abstract
The scale-up of the industrial mixer is always based on operation experience, and lacks theoretical basis. In this paper, effects of scale-up criteria on the mixing time and flow characteristic in the intermittent pump-mixer with single-phase has been studied. Three-dimensional time-dependent mixing prediction has been carried out using multi reference frames (MRF) method and standard k-εmodel embodied by computational fluid dynamics (CFD) package FLUENT6.3. The results indicated that the calculated mixing time was depended on detecting location, but the dependency became weaker by increasing the impeller speed. The power number was obtained at different Reynolds number, and it tended to be a constant as 1.3 under the condition of sufficient turbulence. Geometric similarity ensured the axial flow characteristics in the mixer. The criterion of equal impeller tip speed and equal Reynolds number demanded a longer mixing time and obtained a lower suction pressure head than the benchmark mixer. The criterion of equal circulation time and geometrical similarity could obtain the same mixing time as the benchmark and high suction pressure head, but the power consumption per unit volume sharply increased to 24 times as the benchmark. The criterion of equal power consumption per unit volume and geometrical similarity could obtain a better balance of all the parameters considered, and was considered to be the best one compared with other three criteria.关键词
放大/混合/计算流体力学/混合室/混合时间Key words
scale-up/mixing/CFD/pump-mix mixer/mixing time分类
化学化工引用本文复制引用
唐巧,叶思施,王运东..放大准则对混合澄清槽混合室中混合时间和流动特性的影响[J].化工学报,2016,(2):448-457,10.基金项目
国家重点基础研究发展计划项目（2012CBA01203）。@@@@supported by the National Basic Research Program of China(2012CBA01203) （2012CBA01203）
