摘要
针对Kenics静态混合器加工困难、扭率单一的难题,本研究提出一种新型错位排杆式静态混合器,简称MR混合器,采用错位排杆方式可制造任意扭率的扭旋元件,有效解决Kenics混合器加工困难,扭率单一的难题。在Re=4000~40000时,探究其与Kenics混合器传热性能差异,窜流、阶梯状结构与错位角(θ)对传热性能的影响及强化传热机理。结果表明MR混合器与同长径比Kenics混合器相比传热性能略差1%~8%。但通过调整MR混合器扭率可完全替代Kenics常规扭率混合器。MR元件(θ=9°)有窜流比无窜流时传热性能约提升0.51%,阶梯状结构对全局换热的抑制率约为7.1%。θ≤9°时MR混合器(A=1.3)Nu值高于Kenics(A=1.5)混合器,错位角减小显著提升了换热性能,对综合传热性能的影响较大。
To address the challenges of difficult processing and limited twist ratio in Kenics static mixers,this study proposed a novel misaligned rod arrangement static mixer,referred to as the MR mixer.The misaligned rod design allowed for the fabrication of twisting elements with arbitrary twist ratios,effectively overcoming the limitations of Kenics mixers in terms of manufacturing complexity and lack of twist ratio variability.At Re=4 O00~40000,the differences in heat transfer performance between the MR mixer and the Kenics mixer were investigated,along with the effects of channeling flow,step-like structures,and misalignment angle(θ)on heat transfer performance,as well as the underlying heat transfer enhancement mechanisms.The results indicate that the heat transfer performance of the MR mixer is slightly inferior(by approximately 1%~8%)to that of a Kenics mixer with the same length-to-diameter ratio.However,by adjusting the twist ratio of the MR mixer,it can fully replace conventional Kenics mixers with standard twist ratios.For MR elements withθ=9°,the presence of channeling flow improves heat transfer performance by approximately 0.51%compared to the absence of channeling flow,while the step-like structure suppresses overall heat transfer by about 7.1%.Whenθ≤9°,theNu value of the MR mixer(A=1.3)is higher than that of the Kenics mixer(A=1.5).A reduction in the misalignment angle significantly enhances heat transfer performance and has a considerable impact on overall heat transfer efficiency.
作者
贾成龙
王宗勇
张伟业
李诗博
李晴
Jia Chenglong;Wang Zongyong;Zhang Weiye;Li Shibo;Li Qing(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《低温与超导》
北大核心
2025年第11期90-97,共8页
Cryogenics and Superconductivity
基金
辽宁省教育厅基本科研面上项目(JYTMS20231487)资助。
关键词
错位排杆
错位角
阶梯状结构
强化传热
Misaligned rod arrangement
Misalignment angle
Stepped structure
Enhanced heat transfer
