化工学报2023，Vol.74Issue(10)：4087-4096,10.DOI:10.11949/0438-1157.20230603
肋密度对齿状翅片管外冷凝换热和流动的影响
Effect of fin density on condensing heat transfer and flow outside dentate-fin tubes
摘要
Abstract
The condensing flow and heat-transfer characteristics around dentate-fin tubes were investigated using numerical and experimental methods.Using the examined computational model,the film flow characteristics and condensing heat-transfer coefficient of the dentate-fin tubes in the circumferential and axial directions were analyzed.Comprehensive information regarding the condensation process in high-performance tubes was provided.The results showed that the circumferential and axial film thicknesses of the dentate-fin tubes increased with increasing fin density.The liquid film distribution of dentate-fin tubes with a low fin density was relatively uniform,and condensate drainage was easy.The special heat-transfer structure of dentate-fin tubes was examined,and it was found that the complex heat-transfer structure led to variations in the surface tension,which changes the liquid-film distribution.The local condensing heat-transfer coefficient of the dentate-fin tubes was very sensitive to the liquid-film distribution.The optimal fin density corresponding to the maximum total heat-transfer coefficient was obtained,indicating that the enhanced heat transfer mechanism of dentate-fin tubes is the combined effect of heat transfer area and liquid film thickness.关键词
齿状翅片管/肋密度/冷凝传热/数值模拟/VOFKey words
dentate-fin tube/fin density/condensing heat transfer/numerical simulations/volume of fluid method分类
通用工业技术引用本文复制引用
李猛,陶乐仁,黄理浩,金程..肋密度对齿状翅片管外冷凝换热和流动的影响[J].化工学报,2023,74(10):4087-4096,10.基金项目
上海市动力工程多相流动与传热重点实验室基金项目(1N-15-301-101) （1N-15-301-101）
