Xia Ding, Mao Zijian, Zhou Shuiqing, He Xing, Wang Yixi
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China.
Institute of Innovation Research of Shengzhou, Zhejiang University of Technology, Shengzhou 312400, China.
ACS Omega. 2023 Dec 7;8(50):47635-47645. doi: 10.1021/acsomega.3c05762. eCollection 2023 Dec 19.
Flow interferences occur in the dual-impeller stirred tank between paddles as well as between paddles and baffles and the tank wall, leading to inefficient utilization of the stirring energy. To address this issue, this study investigates the flow characteristics within the mixing tank using Euler-Euler numerical simulation and the particle image velocimetry (PIV) experimental method. The three-dimensional nonconstant flow characteristics are analyzed to optimize the critical stirrer geometry. By employing the Sobol method, an approximate model is established for sensitivity analysis to identify key parameters affecting the solid-liquid dual-impeller stirred tank's performance. Numerical simulations demonstrate that the optimized stirred tank exhibits a significantly improved solid-liquid suspension capacity and considerably reduces flow losses near the wall and baffle areas. Under the designated conditions, the cloud height is increased by 8.7%, and power consumption is reduced by 15.6% compared to the prototype. PIV tests performed on the stirred tank before and after optimization confirmed the reliability of the obtained optimization results. The primary objective of this study is to enhance mixing efficiency and homogeneity in solid-liquid mixing tanks while concurrently minimizing energy consumption and cost. These results validate the feasibility of employing a multiobjective optimal design approach that combines the RBF agent model with the Sobol method. The findings offer valuable insights for the design of similar mixing tanks.
在双桨叶搅拌槽中，桨叶之间以及桨叶与挡板和槽壁之间会发生流动干扰，导致搅拌能量利用效率低下。为了解决这个问题，本研究采用欧拉-欧拉数值模拟和粒子图像测速（PIV）实验方法研究了混合槽内的流动特性。分析了三维非定常流动特性，以优化关键搅拌器几何形状。通过使用索博尔方法，建立了一个近似模型进行敏感性分析，以识别影响固液双桨叶搅拌槽性能的关键参数。数值模拟表明，优化后的搅拌槽具有显著提高的固液悬浮能力，并大大减少了壁面和挡板区域附近的流动损失。在指定条件下，与原型相比，云高增加了8.7%，功耗降低了15.6%。对优化前后的搅拌槽进行的PIV测试证实了所获得优化结果的可靠性。本研究的主要目的是提高固液混合槽中的混合效率和均匀性，同时尽量减少能耗和成本。这些结果验证了采用将径向基函数代理模型与索博尔方法相结合的多目标优化设计方法的可行性。研究结果为类似混合槽的设计提供了有价值的见解。
