化工进展2025，Vol.44Issue(4)：1945-1956,12.DOI:10.16085/j.issn.1000-6613.2024-1933
水平流向不同小流道加热管内超临界CO2的传热特性
Heat transfer characteristics of supercritical CO2 in different heated mini-channels under horizontal flow condition
摘要
Abstract
The convective heat transfer characteristics of supercritical CO2 were investigated experimentally in different heated mini-channels under horizontal flow condition.The results showed that the convective heat transfer coefficients of supercritical CO2 increased significantly with the increase of mass flow rate.But the convective heat transfer coefficients decreased obviously with the increase of heating power and inlet temperature.However,the trends of convective heat transfer coefficient under the pressure condition were totally different.When the fluid temperature was below the pseudo-critical temperature,the convective heat transfer coefficient of supercritical CO2 increased significantly with the loss of pressure.If the fluid temperature was higher than the pseudo-critical temperature,the convective heat transfer coefficient of supercritical CO2 increased significantly with the increase of pressure.The convection heat transfer coefficient of supercritical CO2 significantly rose with the reduction of diameter of mini-channel when the different experimental parameters(pressure,mass flow rate,heating power,and inlet temperature)held constant,respectively.Compared with the convective heat transfer coefficient when the diameter of mini-channel was 1mm,the variation of different experimental parameters had no significant influence on the minimum and maximum of relative heat transfer enhancement rates of supercritical CO2 when the diameters of heated tube were 0.75mm and 0.5mm,respectively.If the buoyancy effect would be ignored in different heated mini-channels.The variation trend of convective heat transfer coefficient could be explained reasonably by the drastic change of thermal physical properties of supercritical CO2 near the pseudo-critical region.关键词
超临界/水平流动/不同管径/对流传热/浮升力Key words
supercritical/horizontal flow/different tube diameter/convection heat transfer/buoyancy分类
数理科学引用本文复制引用
王磊,王艳,甘玉凤,罗凯,费华,栾俨丁..水平流向不同小流道加热管内超临界CO2的传热特性[J].化工进展,2025,44(4):1945-1956,12.基金项目
江西省自然科学基金(20242BAB25281,20242BAB20217) （20242BAB25281,20242BAB20217）
赣鄱俊才支持计划-急需紧缺海外人才引进项目(20242BCE50075) （20242BCE50075）
江西省教育厅科学技术研究项目(GJJ2200817) （GJJ2200817）
江西理工大学高层次人才资助项目(205200100620). （205200100620）
