摘要
针对传统光滑圆管管束流动阻力较大且综合性能不高的问题,本研究通过数值模拟分析了不同管束(圆管、椭圆管、丁胞管及混合管束)的流场分布、换热性能及流动阻力特性.结果表明,椭圆管束由于通流截面积增加,流体平均流速显著低于圆管束,流线型表面增强了丁胞内的三维涡流,提升了流体混合程度.此外,圆管管束的换热性能和流动阻力整体高于椭圆管束,丁胞对椭圆管束的强化效果更为显著.与光滑圆管管束相比,混合椭圆管束的努塞尔数Nu仅降低了9%~13%,而阻力系数f降低了60.2%~60.8%,综合性能PEC提升了19.8%~25%.研究结果为工业余热回收、制冷系统及热泵系统等领域新型高效低阻换热器的开发提供了理论指导.
This study tackled the issue of high flow resistance and poor comprehensive performance in traditional smooth cir-cular tube bundles.The heat transfer and flow resistance for circular,elliptical,and mixed tube bundles had been numerically analyzed.Results show that compared to circular tube bundles,elliptical ones have a lower average fluid velocity due to their lar-ger cross-sectional area.However,their streamlined surface enhances 3D vortices and mixing within the tubes.It has been found that circular tube bundles have better heat transfer performance and higher flow resistance than elliptical ones,but the en-hancement effect of the mixed tube bundles is more pronounced.Compared to smooth circular tube bundles,the mixed elliptical tube bundles have only a 9%~13%drop in Nu,but a 60.2%~60.8%reduction in f,with the comprehensive performance in-dex PEC rising by 19.8%~25%.The research offers theoretical guidance for developing novel,high-efficiency,low-re-sistance heat exchangers for industrial waste-heat recovery and low-temperature systems.
作者
茹静涵
汤松臻
丁亮
周俊杰
Ru Jinghan;Tang Songzhen;Ding Liang;Zhou Junjie(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《低温与超导》
北大核心
2025年第5期78-83,98,共7页
Cryogenics and Superconductivity
基金
国家自然科学基金(52376078)
河南省优秀青年科学基金(242300421063)资助。
关键词
丁胞管
椭圆管
混合管束
流动传热
综合性能
Dimpled tubes
Elliptical tube
Mixed tube bundle
Thermal-hydraulic characteristics
Overall performance
