Critical supercritical-boiling-number to determine the onset of heat transfer deterioration for supercritical fluids

被引:47
|
作者
Xu, Jinliang [1 ]
Zhang, Haisong [1 ]
Zhu, Bingguo [1 ]
Xie, Jian [1 ]
机构
[1] North China Elect Power Univ, Minist Educ, Key Lab Condit Monitoring & Control Power Plant E, Beijing 102206, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Supercritical fluid; Pseudo-boiling; Supercritical-boiling-number; Heat transfer deterioration; Critical heat flux; S-CO2; PRESSURE WATER; VERTICAL TUBE; SMOOTH TUBE; WIDOM-LINE; FLOW; DOWNWARD; POWER; BEHAVIOR; CYCLES; REGION;
D O I
10.1016/j.solener.2019.11.036
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Supercritical fluids such as CO2, water and organic fluids are frequently applied in power systems. The accurate prediction of heat transfer deterioration (HTD) is important to keep the safe operation of advanced power systems such as solar driven supercritical carbon dioxide Brayton cycle. As described in textbooks, it is impossible to identify liquid from gas beyond the critical point, thus supercritical fluid is assumed to have homogeneous structure with a single-phase. The single-phase assumption cannot explain and predict supercritical heat transfer (SHT). Instead, we investigate SHT by the pseudo-boiling concept. Heat transfer is analogized between supercritical pressure and subcritical pressure to create a new non-dimensional supercritical-boiling-number SBO, representing the bubble expansion induced momentum force against the inertia force when it is coupled with the ratio of liquid density with respect to vapor density. Our study reveals sudden changes from normal heat transfer (NHT) to heat transfer deterioration (HTD) with obvious temperature peak when crossing a critical SBO, which is 5.126 x 10(-4), 2.018 x 10(-4), 1.653 x 10(-4) and 1.358 x 10(-4) for CO2, H2O, R134a and R22, determined by a large quantity of database. Our work paves a new way to understand the SHT mechanism and supports the heterogeneous structure of liquid-like fluid and vapor-like fluid for supercritical fluids.
引用
收藏
页码:27 / 36
页数:10
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