摘要
采用响应面法中的Box-Behnken法对新型螺纹管传热性能的优化进行实验设计,以努塞特数(Nu)和摩擦因数(f)为评价指标,研究螺距(P)、肋高(H)、螺纹段与光管段的长度比(L)对传热性能的影响,同时通过分析响应面图研究各参数对Nu和f的交互影响。计算各实验组数的灰色关联等级,使用灰色关联法对新型螺纹管进行多目标优化,并通过分析不同换热管的湍流动能(TKE)分布,得到新型螺纹管增强传热性能的机理。研究表明:通过响应面分析可知L是影响Nu与f最显著的参数;通过灰色关联法分析得到的最优结构参数P=5.5 mm、H=1.00 mm、L=2,这种结构参数下的新型螺纹管Nu值为100.741,f值为0.024 641;通过对比不同换热管的TKE分布发现,新型螺纹管的独特设计即两个旋转方向相反的相邻螺纹段会导致管内的流体流动方向频繁变化,从而加剧径向扰动,更频繁地产生二次流,导致TKE增加,增强其传热性能。通过优化研究,确定了新型螺纹管最优的结构参数,并深入揭示其传热性能增强的机制,为进一步优化和设计新型螺纹管提供了指导和依据。
To optimize the heat transfer performance of a novel threaded tube,an experimental design was developed utilizing the Box-Behnken method within the framework of response surface methodology.The investigation focused on assessing the impacts of pitch(P),rib height(H),and the length ratio of the threaded section to the smooth section(L)on heat transfer using Nusselt number(Nu)and friction factor(f)as performance criteria.Through response surface analysis,the interplay between these parameters and Nu and f was examined.Furthermore,grey relational analysis was conducted to evaluate the experimental groups,and multi-objective optimization was performed using the grey relational method to enhance the heat transfer efficiency of the novel threaded tube.The findings from response surface analysis highlighted L as the most significant parameter affecting Nu and f.By employing the grey relational method with optimized structural parameters(P=5.5 mm,H=1.00 mm,L=2),the Nu value of the novel threaded tube was determined to be 100.741,accompanied by an f value of 0.024641.An analysis of turbulent kinetic energy(TKE)distributions across three distinct types of heat-exchange tubes revealed that the unique design of the novel threaded tube,featuring adjacent threaded section with opposing rotation directions,induced frequent alterations in fluid flow direction within the tube.This resulted in heightened radial disturbances,increased secondary flows,elevated TKE levels,and ultimately improved heat transfer performance.By identifying the optimal structural parameters for the novel threaded tube,a comprehensive understanding of the mechanisms driving its enhanced heat transfer performance was achieved.These insights serve as a basis for future optimization and design refinements of novel threaded tubes,offering valuable guidance for further research endeavors in this field.
作者
林纬
詹宏阳
汪威
朱家豪
张鼎
龚程
郑小涛
徐建民
喻九阳
LIN Wei;ZHAN Hongyang;WANG Wei;ZHU Jiahao;ZHANG Ding;GONG Cheng;ZHENG Xiaotao;XU Jianmin;YU Jiuyang(School of Mechanical and Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety,Wuhan 430205,China)
出处
《武汉工程大学学报》
2025年第1期85-92,共8页
Journal of Wuhan Institute of Technology
基金
国家自然科学基金(52205167)
武汉工程大学科学研究基金(K2021020)。
关键词
螺纹管
灰色关联法
响应面法
强化传热
threaded tubes
grey relational analysis
response surface methodology
heat transfer enhancement
