摘要
三叶孔板换热器是一种新型纵流换热器,广泛应用于核电装备领域。建立了三叶孔板换热器壳单元流道模型,利用商用软件FLUENT 14.0及三种湍流模型对换热器壳程流体流动及传热性能进行数值模拟,通过与试验对比优选了湍流模型。分析了其壳程流体流场和温度场的分布情况及支撑板间距、三叶孔孔高等结构参数对三叶孔板换热器传热和阻力性能的影响。在此基础上,进一步与整体模型的计算结果进行了比较。结果表明:采用可实现k-ε湍流模型的计算结果更为准确;壳程努赛尔数和阻力因子随支撑板间距和开孔高度的增大而减小;综合考虑相关因素,单元流道模型是研究纵流壳程换热器传热与阻力性能的一种可行且高效的模型和方法。
Heat exchangers with trefoil-baffle are a new type heat transfer device and are widely used in nuclear power system due to their special advantages, with the fluid flowing longitudinally on the shell side. A unit duct model for the heat exchanger with trefoil-baffles was established. Based on three fluid dy- namics models, characteristics of fluid flow and heat transfer performance on the shell side were simulated by using commercial CFD software FLUENT 14.0. Compared with the experimental results, the optimal turbulent model was correctly selected. Then the distributions of fluid flow and temperature were analyzed. The effects of structural parameters, such as baffle pitch, trefoil-hole height and so on, on the heat transfer performance and friction factor were investigated. Finally, the numerical results by using unit duct model and whole model were compared. The results show that the calculation based on realizable k-~ turbulent model is much more reliable and accurate. The Nusslet number and friction factor decrease with the in- creasing of baffle pitch, as well as trefoil-hole height. Considering the relevant factors, the unit duct model can be feasibly and efficiently used to study the heat transfer and resistance performance of heat exchangerswith longitudinal flow of shell-side.
出处
《压力容器》
2016年第4期10-17,共8页
Pressure Vessel Technology
基金
上海市浦江人才计划资助项目(14PJD015)
关键词
三叶孔板
换热器
单元流道模型
数值模拟
trefoil-baffle
heat exchanger
unit duct model
numerical simulation
