Study of trailing vortices and impeller jet instabilities of a flat blade impeller in small-scale reactors
Study of trailing vortices and impeller jet instabilities of a flat blade impeller in small-scale reactors
复制标题
小型反应器平叶片叶轮尾涡和叶轮射流不稳定性研究
DOI：
10.1002/aic.17842
复制
发表时间：
2022
期刊：
影响因子：
3.7
通讯作者：
Charalambidou A
中科院分区：
文献类型：
--
作者：
Charalambidou A
经济上可行和有利可图的生产流程的设计通过减少工作量和提高作业频率，推动公司走向集成的连续制造。因此，开发能够进行多变量工艺优化的坚固的小型设备是至关重要的。这项工作的目的是描述在中间𝑅𝑒~3732时运行的毫升级搅拌槽内的流动特征，并评估与挡板存在和尺寸有关的尾涡稳定性。通过计算流体动力学(CFD)计算了速度特性，并对无挡板(UB)和两种挡板构型进行了实验验证。利用本征正交分解(POD)提取影响基本流型的主要时空流动特征。模拟结果与实验结果吻合很好，而POD分析揭示了高能模式和周期模式的存在，这些模式与叶轮射流和反应堆壁之间的相互作用有关。这些模式是叶轮射流不稳定性的原因，挡板的存在和大小放大了这种不稳定性。
The design of economically feasible and profitable production processes has driven companies toward integrated continuous manufacturing by reducing working volumes and increasing operating frequencies. Thus, the development of robust small‐scale devices capable of multivariate process optimization is essential. The aim of this work is to characterize the flow developed in a ml‐scale stirred tank operating at intermediate 𝑅𝑒 ~3732, and assess trailing vortex stability with respect to baffle presence and size. Velocity characteristics are computed via computational fluid dynamics (CFD) and validated experimentally for an unbaffled (UB) and two baffled configurations. Proper orthogonal decomposition (POD) is used to extract dominant spatial–temporal flow features affecting the underlying flow patterns. Results show very good agreement between simulations and experiments, while POD analysis revealed the existence of highly energetic and periodic modes, linked to interactions between impeller jet and reactor walls. These modes are responsible for an impeller jet instability, which is amplified by the presence and size of baffles.