TY - JOUR
T1 - Effects of inclination angle and operation parameters on supercritical CO2 natural circulation loop
AU - Chen, Lin
AU - Zhang, Xin Rong
AU - Deng, Bi Li
AU - Jiang, Bin
N1 - Funding Information:
The support of the National Science Foundation of China (No. 50976002 , No. 51276001 ) and the Common Development Fund of Beijing are gratefully acknowledged.
PY - 2013
Y1 - 2013
N2 - Supercritical fluid based natural circulation flow has been proposed in many energy conversion systems such as solar collector, waste heat recovery, nuclear cooling, etc. The current study is focused on the effect of inclination angle and operation parameters on supercritical CO2 based natural circulation loops. In this study, two-dimensional numerical simulation has been carried out with turbulent model incorporated. Then, a supercritical natural circulation loop system has been established, experimented and also compared with previous studies. In the numerical simulation, the flow condition is found closely related to the heat influx and inclination angle: Under high heat flux conditions the system show stable flow, while relative low heat flux conditions show complex unstable behaviors. Also it is found that when the inclination angle is greater than 60, the effect of inclination on the flow state is not significant. In the experiments, supercritical cases are found stable under the current operation range. The steady operation pressure inside the NCL changes greatly due to the sensitive fluid properties and the effect of inclination on real systems show similar rend with numerical results. Judging from both the numerical and experimental results, larger inclination angles will have higher circulation rate and better heat transfer performance. New correlation for supercritical CO2 NCL flows is also experimentally proposed in this study.
AB - Supercritical fluid based natural circulation flow has been proposed in many energy conversion systems such as solar collector, waste heat recovery, nuclear cooling, etc. The current study is focused on the effect of inclination angle and operation parameters on supercritical CO2 based natural circulation loops. In this study, two-dimensional numerical simulation has been carried out with turbulent model incorporated. Then, a supercritical natural circulation loop system has been established, experimented and also compared with previous studies. In the numerical simulation, the flow condition is found closely related to the heat influx and inclination angle: Under high heat flux conditions the system show stable flow, while relative low heat flux conditions show complex unstable behaviors. Also it is found that when the inclination angle is greater than 60, the effect of inclination on the flow state is not significant. In the experiments, supercritical cases are found stable under the current operation range. The steady operation pressure inside the NCL changes greatly due to the sensitive fluid properties and the effect of inclination on real systems show similar rend with numerical results. Judging from both the numerical and experimental results, larger inclination angles will have higher circulation rate and better heat transfer performance. New correlation for supercritical CO2 NCL flows is also experimentally proposed in this study.
UR - http://www.scopus.com/inward/record.url?scp=84887105237&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84887105237&partnerID=8YFLogxK
U2 - 10.1016/j.nucengdes.2013.06.037
DO - 10.1016/j.nucengdes.2013.06.037
M3 - Article
AN - SCOPUS:84887105237
VL - 265
SP - 895
EP - 908
JO - Nuclear Engineering and Design
JF - Nuclear Engineering and Design
SN - 0029-5493
ER -