柔性桨与自浮颗粒协同强化高黏度流体混沌混合  

Chaotic mixing performance of high-viscosity fluid synergistically intensified by flexible impeller and floating particles

作　　者：刘作华[1] 杨鲜艳[1] 谢昭明[1] 刘仁龙[1] 陶长元[1] 王运东[2] 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]清华大学化学工程系,北京100084

出　　处：《化工学报》2013年第8期2794-2800,共7页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2012CDA01203);教育部新世纪优秀人才支持计划项目(NCET-0552);清华大学化学工程联合国家重点实验室开放课题(SKL-ChE-12A02)~~

摘　　要：高黏度流体混合处于层流状态,存在混沌混合区和隔离区,混沌混合是提高其混合效率的有效方法。为增强高黏度流体的混沌混合,在甘油体系中采用柔性搅拌桨并加入自浮颗粒,实验研究了最大Lyapunov指数(LEmax)随单位体积功耗(Pv)的变化规律。结果表明,只加入固体颗粒对原体系LEmax的影响不大,当Pv=2000W.m-3时,使用柔性桨后体系LEmax增加10.29%;柔性桨与固体颗粒协同作用时,可使体系LEmax增加30.86%。在Pv≤2000W.m-3时,柔性桨和自浮颗粒协同强化高黏度流体混沌混合的效果最好。There are both a chaotic mixing region and an isolated mixing region for the high-viscosity laminar flow mixing system.Increasing chaotic mixing is the effective method to enhance mixing performance.To obtain good mixing performance in the high viscosity fluid mixing system,flexible impeller together with floating particles were used in the glycerol mixing system.The largest Lyapunov exponent（LEmax）was obtained to study the relationship between chaotic mixing degree and power consumption（Pv）.It indicated that only adding the floating particles had no effect on LEmax,but the flexible impeller could contribute to enlarging LEmax.When Pv was 2000 W·m-3,the LEmax of the primary system could be enlarged by 10.29% while using flexible impeller,and when floating particles and flexible impeller worked together,LEmax could be enlarged by 30.86%.At a low Pv（Pv≤2000 W·m-3）,the chaotic mixing of high-viscosity fluid using floating particles synergistically with flexible impeller was much better than the system using the traditional turbine impeller.

关 键 词：柔性搅拌桨 自浮颗粒 高黏度流体 最大LYAPUNOV指数 混沌混合 

分 类 号：TQ027.2[化学工程]