摘要
超临界流体在螺旋管内的传热技术在化工领域被广泛应用。由于其传热与流动机理的复杂性,使得目前这方面的研究相较于直管内的还很匮乏。综述了近几年来国内外学者关于超临界流体在螺旋管内对流换热的研究进展,包括以CO_2和H_2O等常见工质为主的数值模拟研究与试验研究。对数值模型及传热机理进行了分析比较,提出该研究的未来发展方向;总结了现有研究中的浮升力影响准则,并分析了质量流量、压力、热流量以及螺旋管结构参数对传热特性的影响机理。此外,对目前螺旋管内超临界流体的换热关联式进行了归纳总结。期望能对超临界流体在螺旋管内的特殊换热机理有更深入的理解,为今后的具体研究工作奠定理论基础。
The heat transfer technology of supercritical fluids in helically coiled tubes is widely used in the chemical industry.However,due to the complexity of its flow and heat transfer mechanism,the current researches in this area are still scarce compared with that in straight tubes.In this paper,the progress in recent studies(including numerical simulations and experimental researches of common working media like CO 2 and H 2O)on the convective heat transfer of fluids(mainly carbon dioxide and water)at supercritical pressures in helically coiled tubes was reviewed.The numerical model and heat transfer mechanism were compared and analyzed,then the future development direction of this research was proposed;The influence criterions of buoyancy force in present research were summarized,and the influence mechanisms of mass flux,pressure,heat flux as well as tube geometric parameters on heat transfer performance were also analyzed.In addition,the current heat transfer correlations of supercritical fluids in the helically coiled tube were summarized,in the hope to obtain a deeper understanding of this unique heat transfer characteristics in helically coiled tubes,which aims at laying the theoretical foundation for the future specific research work.
作者
陈永东
宋嘉梁
吴晓红
Chen Yongdong;Song Jialiang;Wu Xiaohong(Research Institute of Heat Transfer Technology and Equipment,Hefei General MachineryResearch InstituteCo.,Ltd.,Hefei 230031,China)
出处
《压力容器》
北大核心
2019年第1期54-64,共11页
Pressure Vessel Technology
基金
工信部2014海洋工程装备科研项目(工信部联装[2014]505号)
关键词
超临界流体
螺旋管
对流
传热
浮升力
传热准则式
supercritical fluid
helically coiled tube
convection
heat transfer
buoyancy force
heat transfer correlation
