Gas-liquid mixing performance, power consumption, and local void fraction distribution in stirred tank reactors with a rigid-flexile impeller
Gas-liquid mixing performance, power consumption, and local void fraction distribution in stirred tank reactors with a rigid-flexile impeller
复制标题
DOI：
10.1016/j.expthermflusci.2018.04.006
复制
发表时间：
2018-10
影响因子：
3.2
通讯作者：
Facheng Qiu;Zuohua Liu;Relong Liu;X. Quan;Changyuan Tao;Yundong Wang
中科院分区：
文献类型：
--
作者：
Facheng Qiu;Zuohua Liu;Relong Liu;X. Quan;Changyuan Tao;Yundong Wang
采用最大李雅普诺夫指数（LLE）、相对功率需求（RPD）、功率数NP和局部空隙率等参数表征了带有管式分布器的刚柔桨反应器内气液混合性能。考察了搅拌桨类型、气体流量、搅拌速度、柔性片长度、轴向间距l和角度θ等因素的影响。同时，提出了基于混合指数（MI）的全局变量分析（GVA）来表征混合过程。结果表明，柔性段长度、搅拌速度和气体流量的增加均能提高混合程度。同时轴向间距和角度的减小也能在一定程度上改善气液两相的混合性能。这些发现与MI的调查结果一致。研究结果可为STR的优化设计和工程放大提供理论指导。
In this work, the mixing performance of gas–liquid was characterized by the largest Lyapunov exponent (LLE), relative power demand (RPD), power numberNPand local void fraction in a rigid-flexible impeller reactor equipped with a tube sparger. The effects of impeller types, gas flow rates, agitation speed, flexible piece lengths, axial spacing distanceslhand anglesθwere investigated. Meanwhile, global variable analysis (GVA) based on the mixing index (MI) was proposed to characterize the mixing process. The results show that the increases in flexible piece length, agitation speed, and gas flow rate could enhance the mixing degree. Meanwhile the reductions of axial spacing, and angle were also able to improve the mixing performance of gas–liquid two phases to a certain extent. These findings were in conformity with the results of investigation into MI. The results of this study could provide theoretical guidance for the optimal design and engineering scale-up of STRs.