化工进展2017，Vol.36Issue(2)：465-472,8.DOI:10.16085/j.issn.1000-6613.2017.02.009
三叶孔板强化换热性能及机理分析
Analysis on performance and mechanism of heat transfer enhancement of trifoil-hole baffle
摘要
Abstract
Trifoil-hole baffle is a typical support plate which can improve heat transfer performance of tube and shell heat exchanger in the form of longitudinal flow,with many advantages such as smaller resistance and the ability of flow induced vibration weakening. In order to analyze the heat transfer enhancement effect and mechanism of trifoil-hole baffle on the shell side of tube and shell heat exchanger,a series of unit channel models for trifoil-hole baffle with different hole heightH was built according to the periodical and symmetrical characteristics. The renormalization groupk-epsilon turbulence model and SIMPLE coupling algorithm were adopted for numerical simulation of shell side flow and comprehensive heat transfer performance evaluation. Results showed that Nusselt numberNu and resistance coefficientf of heat exchanger with trifoil-hole baffle are all larger than that without trifoil-hole baffle. Both the relative ratio ofNu/Nu0 andf/f0decrease withH but the value of performance evaluation indicators(PEC)increases with H. Besides,the surface average of synergy angleβ is lesser and longitudinal vortex magnitudeΩx is larger for heat exchanger with trifoil-hole baffle compared with that without trifoil-hole baffle,which illustrate the improvement of field synergy and intensification of longitudinal vortex all contribute to the heat transfer enhancement of trifoil-hole baffle.关键词
三叶孔板/强化换热/综合性能/机理分析Key words
trifoil-hole baffle/heat transfer enhancement/comprehensive performance/mechanism analysis分类
能源科技引用本文复制引用
魏志国,李华峰,柯汉兵,张克龙..三叶孔板强化换热性能及机理分析[J].化工进展,2017,36(2):465-472,8.基金项目
国家自然科学基金（51406138）及湖北省自然科学基金（2015CFB521）项目。 （）
