叉排三维肋扁管管束流动换热特性的数值模拟
首发时间:2020-03-20
摘要:三维肋扁管换热性能优异,非常符合紧凑式换热器的设计需求。本文采用数值模拟方法对叉排布置的三维肋扁管管束的流动换热特性进行研究,分析了管束横向间距和纵向间距对三维肋扁管管束换热特性、阻力特性以及综合换热能力的影响规律。结果表明,三维肋扁管管束的综合换热性能强于光扁管管束,在不同管束结构下均为光扁管管束的2倍以上。横向间距对三维肋扁管管束的流动换热特性有显著影响,研究范围内随横向间距的增大,管束努塞尔数和阻力系数可分别减小32%~41%和73%~78%,横向间距较大的管束在雷诺数较大时表现出更好的综合换热性能。纵向间距对三维肋扁管管束的流动换热特性影响较小,在研究范围内不同纵向间距管束的努塞尔数和阻力系数的变化幅度不超过3.5%和3%
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Numerical simulation of flow and heat transfer characteristics in 3-D finned flat tube bundles with staggered layouts
Abstract:Three-dimensional finned flat tube has excellent heat transfer performance, and is very suitable for the design of compact heat exchanger. Numerical method is used to simulate the flow heat transfer characteristics of 3-D finned flat tube bundles with staggered layouts in this study. The comprehensive heat performance and the influences of transversal tube spacing and longitudinal tube spacing on the heat transfer and flow resistance were presented. The results show that the comprehensive heat transfer performance of the 3-D finned tube bundle is better than that of the smooth flat tube bundle, which is more than twice that of the smooth tube bundle under different tube bundle structures. Transverse tube spacing has a significant influence on the flow and heat transfer characteristics of 3-D finned flat tube bundles, with the increase of transverse tube spacing, the Nussel number and resistance coefficient decreased by 32%~41% and 73%~78% respectively. 3-D finned flat tube bundles with larger transverse tube spacing shows better comprehensive heat transfer performance when Reynolds number is larger. The longitudinal tube spacing has a smaller effect on the flow and heat transfer characteristics of 3-D finned flat tube bundles, the variation magnitude of Nussel number and resistance coefficient of tube bundles were no more than 3.5% and 3% respectively under the study range.
Keywords: flowandheattransfer;3-D finnedflattube;numerical simulation;heatexchanger
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