化工学报2011，Vol.62Issue(10)：2691-2698,8.DOI:10.3969/j.issn.0438-1157.2011.10.003
Rushton搅拌釜内的气含率分布及其流动特性的模拟
Simulation for gas hold-up distribution and flow behavior in Rushton stirred tank
摘要
Abstract
Reynolds stress model was combined with the multiple reference frame (MRF) approach to simulate gas-liquid flow characteristics in a stirred vessel agitated by a Rush ton turbine, and an array of gas hold-up distribution in different cross sectional places was obtained. The numerical simulation results were compared with the experimental data measured by a developed gamma ray computed tomography (CT) system. The CFD simulation results are in reasonable agreement with the experimental data except the discharge flow region. It is indicated that the gas hold-up distribution in the discharge flow region is higher than that in other regions. At high speed of rotary agitator, the fluid discharges rapidly along the surface of blade-tips, and the turbulent dispersion is extraordinarily intense. Radial and axial velocity distribution profiles of the liquid phase under different experimental conditions have been discussed. It is demonstrated that the maximum radial velocity of single-phase flow is closer to mixing blade-tips, while the maximum radial velocity of the two-phase flow has a small outward translation. After reached the critical condition, from the outward blade-tips to the wall, the velocity distribution profile of liquid phase is barely influenced by gas flow rate along radial position, but the influence of impeller rotation speed can not be neglected. On the blade-tip surface, both impeller rotation speed and gas flow rate have seriousinfluence on the axial distribution of radial liquid velocity, and the effect of gas flow rate is more significant than impeller rotation speed.关键词
雷诺应力模型/气液流动/气含率分布/速度分布Key words
Reynolds stress model/ gas-liquid flow/ gas holdup distribution/ velocity distribution分类
化学化工引用本文复制引用
李伟,刘跃进,孔丽娜,韩路长..Rushton搅拌釜内的气含率分布及其流动特性的模拟[J].化工学报,2011,62(10):2691-2698,8.基金项目
国家自然科学基金项目(20776121) （20776121）
湖南省高校环境友好催化与绿色化工工艺科技创新团队支持计划 （）
湖南省高校绿色催化与反应工程重点实验室开发基金项目. （）
