化工学报2019，Vol.70Issue(12)：4546-4555,10.DOI:10.11949/0438-1157.20190685
半周加热横纹管内熔盐强化传热特性
Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating
摘要
Abstract
The semi-circumferential heating of the solar heat absorber tube has an effect on the convective heat transfer coefficient in the tube. Base on this, convection heat transfer experimental system and mathematical model of transverse corrugated tube are established to analyze the heat transfer performance of molten salt with different groove width and height. The results show that the circumferentially temperature of inner wall increases, and the circumferentially local Nusselt number decreases first and then increases to stability with transverse corrugated tube from adiabatic side to heated side. The axial temperature of inner wall with groove obviously lower than that of smooth section, the axial local Nusselt number of groove in transverse corrugated tube is relatively large, and the convergence of after groove and smooth section is minimal. The axial local Nusselt number of heated side and the average Nusselt number in transverse corrugated tube decrease with the groove width increases, while the PEC (comprehensive performance evaluation factor) rises. The axial local Nusselt number, the average Nusselt number and Nu/NuST (enhanced heat transfer ratio) increase with the groove height increment. The PEC of transverse corrugated tube is obvious affected by groove width, while the Nu/NuST is remarkable affected by groove height. The Nusselt number rule equation of molten salt in transverse corrugated tube with circumferentially non-uniform heat flux is obtained, and the maximum deviation of Nu between calculated and simulated value is within ±7%.关键词
半周加热/横纹管/熔盐/传热/太阳能/对流Key words
semi-circumference heating/ transverse corrugated tube/ molten salt/ heat transfer/ solar energy/convection分类
能源科技引用本文复制引用
沈向阳,丁静,陆建峰..半周加热横纹管内熔盐强化传热特性[J].化工学报,2019,70(12):4546-4555,10.基金项目
国家自然科学基金项目(51606227) （51606227）
