Chaotic Mixing Intensification and Flow Field Evolution Mechanism in a Stirred Reactor Using a Dual-Shaft Eccentric Impeller,Industrial & Engineering Chemistry Research

当前位置： X-MOL 学术 › Ind. Eng. Chem. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Chaotic Mixing Intensification and Flow Field Evolution Mechanism in a Stirred Reactor Using a Dual-Shaft Eccentric Impeller
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-22 , DOI: 10.1021/acs.iecr.2c00946
Hong Yao _{1,

2} , Jinjing Tang _{1,

2} , Zuohua Liu _{1,

2} , Changyuan Tao _{1,

2} , Yundong Wang ₃

Affiliation

Nearly 95% of the energy in the stirred reactor maintains the symmetrical flow field structure formed by fluid rotation, which reduces the efficiency of fluid transfer. In this paper, a dual-shaft eccentric impeller based on the Rushton turbine (RT) and pitched blade Rushton turbine (PBRT) was proposed to eliminate the stable symmetrical flow field structure in the mixing tank and improve the fluid transfer efficiency and chaotic mixing degree. The effects of impeller types, the height difference between impellers, and shaft eccentricity on the single-phase flow field were researched. The power consumption, mixing time, chaotic characteristic parameter the largest Lyapunov exponents, flow field structure evolution, and fluid velocity of different dual-shaft eccentric impeller systems were also investigated through experiments and computational fluid dynamics simulation. Results showed that changing the impeller types and height difference on different shafts could improve the mixing efficiency at a lower power consumption incremental level. Meanwhile, both visual experiments and numerical simulation analysis demonstrate that the reasonable combination of the above two variables can make full use of the advantages of different impellers, strengthen the fluid transfer, destroy the symmetrical structure of the flow field in the stirred reactor, and enhance the energy dissipation of the system through the fluid transfer effect between blades and the coupling effect of height difference, which is conducive to improving the mixing efficiency of the system.

中文翻译：

双轴偏心叶轮搅拌反应器混沌混合强化及流场演化机制

搅拌反应器中近95%的能量维持了流体旋转形成的对称流场结构，降低了流体传输的效率。本文提出了一种基于拉什顿涡轮（RT）和斜叶拉什顿涡轮（PBRT）的双轴偏心叶轮，以消除混合罐内稳定的对称流场结构，提高流体传递效率和混沌混合程度。 . 研究了叶轮类型、叶轮高度差、轴偏心距对单相流场的影响。功耗、混合时间、混沌特性参数、最大李雅普诺夫指数、流场结构演化、还通过实验和计算流体动力学模拟研究了不同双轴偏心叶轮系统的流体速度和流体速度。结果表明，改变不同轴上的叶轮类型和高度差可以在较低的功耗增量水平上提高混合效率。同时，视觉实验和数值模拟分析均表明，上述两个变量的合理组合可以充分利用不同叶轮的优势，加强流体传递，破坏搅拌反应器内流场的对称结构，提高系统通过叶片间的流体传递作用和高差的耦合作用来消散系统的能量，有利于提高系统的混合效率。

更新日期：2022-06-22

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11