摘要
采用数值模拟的方法,建立合理简化的缠绕管式换热器的流体动力学模型,考察缠绕管式换热器的壳程结构参数对其流动和换热性能的影响.结果显示,换热器盘管层数的增加并未带来努赛尔数的明显变化,仅阻力系数的增大不足以引起换热器综合性能评价因子数值的波动.随着换热管轴向间距加大,努赛尔数、阻力系数和综合性能评价因子都呈现出先增大后减小的趋势.换热器垫条厚度的增加则会引起努赛尔数的增加,伴随阻力系数降低,综合性能评价因子的数值明显升高.对比后得知,垫条厚度对缠绕管式换热器的换热和流动性能的影响最为显著.研究结果可为缠绕管式换热器优化设计提供参考.
The fluid dynamics models of the coiled tube heat exchanger with reasonable simplification were established by numerical simulation.Based on comparison and analysis,the effects of shell-side structural parameters of the coiled tube heat exchanger on its flow and heat transfer performance were investigated,and the following conclusions were propose.With the increase in the layer number of coil,the number of Nussel subtle changed.The increase in the drag coefficient was not enough to affect the comprehensive performance evaluation factor.With the increase of axial spacing,the number of Nussel,the resistance coefficient and the comprehensive performance evaluation factor showed tendency of first increasing and then decreasing.The increase in the thickness of the heat exchanger pad caused an increase in the number of Nussel.With the decrease in resistance coefficient,the comprehensive performance evaluation factor increased significantly.Compared the variation of comprehensive performance evaluation factor of heat exchangers with different structural parameters,the influence of the thickness of the pads was most obvious.The results could provide reference for the optimum design of wound-tube heat exchanger.
作者
陈晓彦
黄云云
张朱武
黄永曙
CHEN Xiaoyan;HUANG Yunyun;ZHANG Zhuwu;HUANG Yongshu(College of Chemical Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;JHICC Integrated Circuit,Quanzhou,Fujian 362200,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2020年第1期110-115,共6页
Journal of Fuzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(51705077)
福建省自然科学基金资助项目(2018J01768)
关键词
缠绕管式换热器
数值模拟
壳程
传热性能
流动性能
wound-tube heat exchanger
numerical simulation
shell side
heat transfer performance
flow performance
