化工学报2019，Vol.70Issue(7)：2456-2471,16.DOI:10.11949/0438-1157.20181534
缠绕管式换热器壳程强化传热性能影响因素分析
Study on effects of structural parameters on shell-side heat transfer enhancement in spiral wound heat exchangers
GAO Xinghui 1ZHOU Guoyan 1TU Shandong1
作者信息
- 1. Key Laboratory of Pressure Systems and Safety,Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology , Shanghai 200237, China
- 折叠
摘要
Abstract
Due to the lack of internal flow field information, the influence of structural parameters on fluid flow is not clear, which makes the heat transfer mechanism of the shell-tube heat exchanger shell side unclear and hinders the further standardization and generalization of its design criteria. Aiming at the above problems, geometry modeling and corresponding numerical simulations were carried out for the shell side flow of spiral wound heat exchangers. The feasibility and accuracy of these modellings were verified by comparing with experimental data in the literature. Then the flow field and characteristics of shell side fluid were investigated in detail. The heat transfer enhancement mechanism was further discussed based on the analysis of the influences of key structural parameters on the heat transfer and resistance performance. The results show that the fluid flow on the shell side can be described more accurately by using Realizable k-ε turbulence model. The Nusselt number increases linearly with the increase of the Reynolds number in a log-log coordinate system, while the friction factor f decreases linearly. The Nusselt number increases as the results of increased winding tube diameter d and average winding diameter D, and decreased pitch S. But it was opposite for the friction factor f. The heat transfer and resistance performance of the shell side are mostly affected by the winding tube diameter d, and the average winding diameter D does the least. Increased winding tube diameter d and average winding diameter D will break the boundary layer of the fluid flow. Then the fluid disturbance increases and hence the temperature increases faster. It is beneficial to enhance heat transfer on shell side. While increased pitch S will make the fluid flow much more smoothly, which causes velocity boundary layer to thicken. Thus flow resistance and temperature rising rate are reduced, it is not good for enhancement of heat transfer on shell side.关键词
缠绕管式换热器/数值模拟/强化传热/传热与阻力性能/结构参数敏感性Key words
spiral wound heat exchanger/numerical simulation/heat transfer enhancement/heat transfer and resistance performance/structural parameters sensitivity分类
能源科技引用本文复制引用
GAO Xinghui,ZHOU Guoyan,TU Shandong..缠绕管式换热器壳程强化传热性能影响因素分析[J].化工学报,2019,70(7):2456-2471,16.
