摘要
提高混合效率是流体搅拌混合领域的重点研究内容之一。几十年来,人们在开发新型搅拌桨及研发流体混合新技术方面做了大量工作。基于刚性Rushton桨,开发了一种柔性叶片Rushton搅拌桨,并以罗丹明6G为荧光剂,采用平面激光诱导荧光法对介质为水时该桨在湍流状态下的混合性能进行了实验测试研究。结果发现,标定实验结果表明,荧光剂强度与浓度呈线性关系,可以此为基准衡量同等实验条件下的宏观混合时间。荧光剂的扩散情况表明,与刚性桨相比,柔性桨具有更好的混合性能,尤其在混合的初始阶段,混合均匀程度及混合速度均有一定的优势。与刚性桨混合时间的对比表明,柔性桨的宏观混合时间较短,有助于提高流体混合效率。研究结果为该桨的工业应用奠定了基础。
Rapid mixing is the key factor to efficient operation of many industrial devices involving fluid flow.During the past several decades,extensive contributions have been made to improve the mixing effect and efficiency either by modifying and developing new types of impellers,or by employing and developing new fluid mixing techniques.In this paper,the turbulent mixing characteristics of the flexible-blade Rushton impeller developed by ourselves were experimentally studied by the planar laser induced fluorescence(PLIF)technique.Roddinmin 6 G was used as fluorescer.The agitated fluid was water.Result of the calibration experiment shows that the fluorescer luminosities are linear with their concentration,which can be used as a benchmark to measure the mixing time under the same experimental conditions.Diffusion processes of fluorescer show that flexible-blade Rushton impeller has better mixing performance than the standard Rushton impeller.It can improve the mixing uniformity and increase the mixing speed,especially at the initial stage of the mixing process.By comparison with standard Rushton impeller,it was found that mixing time of flexible-blade Rushton impeller is shorter,which is helpful to improve the fluid mixing efficiency.Results of this work lay a solid foundation for the industrial application of this impeller.
作者
杨锋苓
张翠勋
李美婷
YANG Fengling;ZHANG Cuixun;LI Meiting(School of Mechanical Engineering,Shandong University,Jinan 250061,Shandong,China;Key Laboratory of High-Efficiency and Clean Mechanical Manufacture(Shandong University),Ministry of Education,Jinan 250061,Shandong,China;National Experimental Teaching Demonstration Center of Mechanical Engineering,Shandong University,Jinan 250061,China;Shandong Tianli Energy Co.,Ltd.,Jinan 250100,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第2期626-632,共7页
CIESC Journal
基金
山东省重点研发计划项目(2016GGX103035,2017GGX70101)
关键词
搅拌容器
柔性Rushton搅拌桨
混合
实验测量
平面激光诱导荧光
stirred vessel
flexible-blade Rushton impeller
mixing
experimental measurement
planar laser induced fluorescence
