CFD modelling and mixing in stirred tanks
CFD modelling and mixing in stirred tanks
复制标题
DOI：
10.1016/s0009-2509(98)00334-0
复制
发表时间：
1999-07
影响因子：
4.7
通讯作者：
A. Sahu;Perumal Kumar;A. Patwardhan;J. Joshi
中科院分区：
文献类型：
--
作者：
A. Sahu;Perumal Kumar;A. Patwardhan;J. Joshi
为了制定合理的设计程序，搅拌容器，几个重要的问题必须加以解决。首先，有必要将叶轮-容器几何形状与所产生的流场相关联。其次，建立搅拌釜内的能量平衡是必要的。第三，有必要了解流场与设计目标之间的联系。所有这三个方面都在这里得到了解决。对五种不同设计的轴流式叶轮进行了研究。Sahu等人（1998 Ind. Engng Chem.Res.37，2116-2130.）已经被扩展到预测由这些叶轮产生的流场。据观察，湍流动能（k）的预测显着改善使用分区模拟。本文提出了一种新的估算湍流能量耗散率的方法。这种新方法提供了很好的比较之间的估计值和CFD模拟。CFD模拟已经扩展到预测不同叶轮的混合时间。预测的混合时间与Rewatkar和Joshi（1991，Chem. Engng commun. 91，322-353）。
In order to develop rational design procedures for stirred vessels, several important points have to be addressed. Firstly, it is necessary to relate the impeller-vessel geometry to the flow field produced. Secondly, it is necessary to establish energy balance in stirred vessels. Thirdly, it is necessary to understand the linkage between the flow field and the design objective. All the three aspects have been addressed here. Five different designs of axial flow impellers have been studied. The zonal modelling concept used by Sahu et al. (1998 Ind. Engng Chem. Res. 37, 2116–2130.) has been extended to predict the flow field generated by these impellers. It is observed that the predictions of turbulent kinetic energy (k) were significantly improved by using zonal modelling. A new method has been proposed to estimate the values of turbulent energy dissipation rate (ε). This new method gave excellent comparison between the estimated values and CFD simulations. The CFD simulations have been extended to predict the mixing time for different impellers. The predicted mixing times are in excellent agreement with the experimental measurements of Rewatkar and Joshi (1991, Chem. Engng commun. 91, 322–353).