Study on heat transfer characteristics of supercritical CO2/propane mixtures in vertical tube

被引：2
作者：
Yin, Dandan [1 ]
Zhou, Yunlong [1 ]
Guo, Xintian [1 ]
机构：
[1] Northeast Elect Power Univ, Coll Energy & Power Engn, Jilin 132012, Peoples R China
来源：
ANNALS OF NUCLEAR ENERGY | 2024年 / 196卷
关键词：
Supercritical fluid; Vertical pipe; Heat transfer; Correlation; CO2-based mixtures; CO2-BASED BINARY-MIXTURE; CARBON-DIOXIDE; BRAYTON CYCLE; TRANSFER PERFORMANCE; WORKING FLUID; PRESSURE CO2; FLOWS;
D O I：
10.1016/j.anucene.2023.110223
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The performance optimization of the Brayton cycle could be achieved by further investigation of supercritical CO2/propane mixtures. In this paper, the heat transfer characteristics of supercritical CO2/propane mixtures in a vertical tube are numerically analyzed. The addition of propane could reduce or even eliminate heat transfer deterioration. Compared to CO2, the wall temperature peak of CO2/propane mixtures (alpha = 7 %) could be reduced by 45.5 K. After the pseudo-critical temperature, the effect of heat flux on the wall temperature of CO2 is more significant than that of mixture. Further, new critical heat flux criterion and Nu correlations are proposed for supercritical CO2/propane mixtures. The correlations could accurately reproduce the trend of Nu and capture the onset of heat transfer deterioration in the upward flow. At Re = 40168-84765 and Pr = 1.2-5.4, the maximum prediction deviation of the new correlations is +/- 14 %. Approximately 98.4 % of the prediction deviations are within +/- 10 %.
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页数：20
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