Numerical study on heat transfer and flow oscillations of supercritical-pressure water in helical tubes

被引：2
|
作者：
Liu, Mengmeng [1 ,2 ]
Zhang, Zhen [1 ]
Yang, Xingtuan [1 ]
Jiang, Shengyao [1 ]
机构：
[1] Tsinghua Univ, Inst Nucl & New Energy Technol, Collaborat Innovat Ctr Adv Nucl Energy Technol, Key Lab Adv Nucl Reactor Engn & Safety,Minist Educ, Beijing 100084, Peoples R China
[2] Chengdu Holy Ind & Commerce Corp Ltd, Pengzhou 611936, Peoples R China
来源：
ANNALS OF NUCLEAR ENERGY | 2024年 / 208卷
关键词：
Supercritical-pressure water; Flow oscillation; Wall thickness; Wall heat capacity; Helix diameter; PARALLEL CHANNELS; CARBON-DIOXIDE; INSTABILITY; PREDICTION; DESIGN; FLUIDS;
D O I：
10.1016/j.anucene.2024.110743
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：
A deep understanding of flow oscillations of supercritical fluids in helical tubes is of great significance for the safety of supercritical steam generators. A numerical study was conducted on the flow oscillations of water in helical tubes with various wall heat capacities and helix diameters at a supercritical pressure of 24.5 MPa. For steady-state calculations, the flow and heat transfer characteristics of supercritical-pressure water were investigated in 2-mm-thick helical tubes with various helix diameters. For transient calculations, the mass flow rate oscillated intensely beyond a heating power threshold in the tube with zero-thickness wall, while the flow characteristics in tubes with finite-thickness walls with various wall heat capacities were significantly different. The flow and heat transfer characteristics are presented during the heating process at various times under flow oscillations. The flow oscillations in helical tubes with various helix diameters are also analyzed to determine the effects of the centrifugal force.
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页数：17
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