Heat transfer deterioration and visualized flow state of supercritical CO2 in a vertical non-circular channel

被引：15

作者：

Du, Xin ^{[1
]}

Zhu, Xiaojing ^{[1
]}

Yu, Xiao ^{[2
]}

Wu, Fayu ^{[1
]}

Qiu, Qinggang ^{[1
]}

机构：

[1] Dalian Univ Technol, Key Lab Ocean Energy Utilizat Energy Conservat, Minist Educ, Dalian 116024, Peoples R China

[2] Aero Engine Corp China, Shenyang Aeroengine Res Inst, Shenyang 110015, Peoples R China

来源：

NUCLEAR ENGINEERING AND DESIGN | 2022年 / 386卷

基金：

中国国家自然科学基金;

关键词：

CARBON-DIOXIDE; BOILING-NUMBER; MINI-TUBE; PRESSURE; BUOYANCY; ONSET; WATER; CYCLE;

D O I：

10.1016/j.nucengdes.2021.111574

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：

An experimental investigation on heat transfer deterioration and the discussion of visualized flow states for supercritical CO2 flow in a non-circular channel were here proposed. A significant blurred shadow, induced by local density variations, was photographed in near heated wall region as heat transfer deterioration occurred. The blurred shadow qualitatively showed the special flow changes of supercritical fluids. The effects of system parameters were studied and the heat transfer correlations were evaluated by obtained experimental data. Three Dittus-Boelter type correlations showed better predictions, while the semi-empirical correlation with physical meaning showed the worst. Combined with the analysis of buoyancy, a modified heat transfer correlation for present experiments was suggested and it was compared with that for tube flows. The experimental findings and visualized flow state may further strengthen the understanding on supercritical heat transfer and extend the researches of supercritical fluids in non-circular channels.

引用

页数：13

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