摘要
根据搅拌槽内的流动呈各向异性的特点 ,引入适用于强旋转流场的各向异性k -ε湍流模型 ,用改进的内外迭代法对有挡板的Rushton桨搅拌槽进行了整体数值模拟 .利用文献中对搅拌槽内流场测定结果 ,给出了适用于Rushton桨搅拌槽的各向异性湍流黏度系数值 .模拟计算得到了搅拌槽内的流场分布和脉动速度分布 ,并同标准k -ε湍流模型计算结果及文献数据进行比较 .结果表明 ,各向异性k -ε湍流模型能成功反映Reynolds应力、湍流动能等湍流特征量 ,明显优于标准k -ε湍流模型 .
In accordance with anisotropic feature of turbulent flow,an anisotropic k-ε turbulence model is used to predict the turbulent flow field and turbulent intensity generated by a Rushton disc turbine with the improved inner-outer iterative procedure considering the feature of flow swirl in the stirred tank.The predicted flow patterns are compared with experimental data and the simulation results with the standard k-ε turbulence model.The anisotropic k-ε turbulence model gives better prediction than the standard k-ε turbulence model.The predicted turbulent flow field is in agreement with to experimental data and the trend of the turbulence intensity can be effectively reflected in the simulation.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2002年第11期1153-1159,共7页
CIESC Journal
基金
国家自然科学基金资助项目 (No .2 9792 0 74)~~
