扭曲椭圆管内强化传热及熵产特性  

Heat Transfer Enhancement and Entropy Generation Characteristics in Twisted Elliptical Tubes

作　　者：冯俊奇 田果 王梦轩 谈莹莹[1] 王占伟 王林[1] 李修真 FENG Junqi;TIAN Guo;WANG Mengxuan;TAN Yingying;WANG Zhanwei;WANG Lin;LI Xiuzhen(Institute of Building Energy and Thermal Science and Technology,Henan University of Science and Technology,Luoyang 471023,Henan,China)

机构地区：[1]河南科技大学建筑能源与热科学技术研究所,河南洛阳471023

出　　处：《新能源进展》2024年第4期473-481,共9页Advances in New and Renewable Energy

基　　金：河南省高校科技创新团队项目(22IRTSTHN006);河南省高校科技创新人才项目(22HASTIT025)。

摘　　要：为探究扭曲椭圆管内强化传热及熵产特性,基于实验验证,在雷诺数(Re)为710~4790范围内,采用数值模拟方法着重分析了包含扭曲比(P/D)和长短轴比(A/B)在内的结构参数及Re对扭曲椭圆换热管内传热和流动阻力性能的影响规律,并依据熵产理论分析扭曲椭圆管内的熵产特性,以期揭示扭曲椭圆管内流体对流传热强化机理。结果表明:扭曲椭圆管内对流传热性能、流动阻力及总熵产随Re的增大而分别增大、减小及增大,随P/D的减小或A/B的增大均增大,且总熵产主要由传热过程不可逆损失引起;当A/B=2.16和P/D=11.90时,传热系数(h)和压降(Δp)均达到最大值;此外,当P/D=26.33和A/B=1.34时,总熵产最小。To investigate the heat transfer enhancement and entropy generation characteristics of twisted elliptical tubes,based on the experimental verification,the effects of the structural parameters,including twist ratio(P/D),ratio of major to minor axis(A/B),and the flow parameter Reynolds number(Re)on the heat transfer and flow resistance performance in twisted elliptical tubes were analyzed by numerical simulation method in the range of Re from 710 to 4790.According to entropy generation theory,the entropy generation characteristics of the twisted elliptical tubes were discussed to reveal the mechanism of fluid convection heat transfer enhancement inside twisted elliptical tubes.The results showed that the convective heat transfer performance,flow resistance,and total entropy generation inside the twisted elliptical tubes were increased,decreased,and increased with the rise of Re,respectively;all increased with a decrease of P/D or an increase of A/B,and irreversible losses in the heat transfer process mainly caused the total entropy generation.When A/B=2.16 and P/D=11.90,the heat transfer coefficient(h)and pressure drop(Δp)reached their maximum value.Furthermore,the total entropy generation reached the minimum at P/D=26.33 and A/B=1.34.

关 键 词：扭曲椭圆管 强化传热 数值模拟 熵产理论 

分 类 号：TK28[动力工程及工程热物理—动力机械及工程]