Abstract: In the domain of industrial mixing technology, the wafer static mixer, characterized by its distinctive bent ear plate mixing element, has drawn considerable attention. It presents remarkable structural benefits over traditional static mixers, such as a more straightforward design and reduced pressure drop. Notably, with the dispersed phase inlet positioned behind the ear plate, it effectively precludes pipeline clogging when dealing with high-viscosity media post-mixing reactions, which is a common issue in many industrial applications. The bending angle of the ear plate, being the solitary mixing element in this mixer, is a critical parameter that directly governs the hydraulic environment and, consequently, the mixing efficacy. To meticulously explore this influence, a specialized model is devised, wherein only the bending angle varied while keeping the flow area constant. By leveraging advanced numerical simulation methodologies and conducting meticulous visual experiments, an in-depth analysis is conducted to unravel the characteristics of the outlet flow field and the homogeneity of mixing. The research outcomes demonstrated that a 10° bending angle is pivotal in attenuating the Coanda effect, leading to the most symmetrical flow field. This optimal configuration culminates in superior mixing performance, as manifested by excellent mixing over a relatively short distance and accompanied by a conspicuously low pressure drop. The indoor experimental results not only validate the numerical simulation findings but also provide practical evidence of the mixer's behavior in real-world scenarios. In summary, the insights gleaned from this study offer substantial theoretical underpinnings for the optimization and engineering implementation of wafer static mixers. They serve as a scientific bedrock for the design and development of highly efficient static mixers in the chemical engineering and allied industries, thereby fueling innovation and advancements in mixing technologies and process optimization strategies. This research contributes to a deeper understanding of the complex fluid dynamics within the mixer and paves the way for more efficient and reliable industrial mixing processes.

Key words: wafer static mixer, numerical simulation, visual experiments, mix, Coanda effect, bending angle of ear plate

摘要： 薄板式静态混合器采用1个耳状薄板结构的混合元件完成两种介质的混合，其结构比常规静态混合器更简单、压降更低；尤为重要的是分散相注入口设置在耳板后，处理混合后产生的高黏度介质时，可以避免管路堵塞。带折弯耳板的薄板是薄板式静态混合器内唯一混合元件，耳板折弯角度直接影响混合水力环境。本工作构建保持过流面积不变而只改变耳板折弯角的模型，通过数值模拟和可视化实验分析薄板式静态混合器耳板出口处流场特性，考察流体混合的不均匀系数(CoV)和压降(ΔP)随耳板折弯角度的变化规律。结果表明，耳板后流体向一侧偏移的康达效应与其折弯角密切相关，在折弯角为10°时，康达效应最弱，流体的分布对称性能最佳。康达效应对混合效果有负面影响，折弯角为10°时的对称流状态下混合效果最佳，CoV降低到0.05所需的完全混合距离仅3.4D，压力损失仅4.26 kPa。

关键词: 薄板式静态混合器, 数值模拟, 可视化实验, 混合, 康达效应, 耳板折弯角度