NUCLEAR TECHNIQUES, Volume. 45, Issue 12, 120605(2022)
Numerical simulation of steam bubble dynamics at microcrack in LBE descending flow field
Figures & Tables(15)
Fig. 1. Diagram of geometric model in computational domain (a) Single tube, (b) 3×3 tube bundle
Fig. 2. Effect of grid size on bubble shape (a) 0.025 mm, (b) 0.050 mm, (c) 0.100 mm, (d) 0.150 mm
Fig. 3. Velocity cloud for 0.25 m·s-1 inlet velocity of LBE (a) Single pipe, geometry size: 200 mm×50 mm, (b) 3×3 tube bundle, geometry size: 250 mm×81 mm
Fig. 4. The process of bubble growth and detachment under steam seepage
Fig. 5. Influence of contact angle on steam bubble growth and detachment at top crack
Fig. 6. Influence of contact angle on steam bubble growth and detachment at lateral crack
Fig. 7. Influence of contact angle on steam bubble growth and detachment at bottom crack
Fig. 8. The process of bubble growth and detachment under low steam jet velocity
Fig. 10. Effect of increase the flow rate of LBE descending flow field
Fig. 11. The accumulation of steam bubbles in 3×3 tube bundle flow field
Table 1. Geometry parameters of computational domain
View tableView in ArticleTable 1. Geometry parameters of computational domain
参数 Parameters 单管计算域几何
Single-tube computational
domain geometry
3×3管束计算域几何
3×3 bundle computational
domain geometry
计算域宽度 Width of computational domain / mm 50 81 计算域长度 Length of computational domain / mm 200 250 传热管外径 External diameter of tubes / mm 19 19 裂纹管中心到出口距离 Distance from cracked tube center to outlet / mm 150 180 轴向管中心距 Axial tube center distance / mm — 25 径向管中心距 Radial tube center distance / mm — 25
Table 2. Properties of LBE and vapor
View tableView in ArticleTable 2. Properties of LBE and vapor
物质 Material 密度
Density / kg·m-3
动力粘度
Dynamic viscosity / N·s·m-2
表面张力
Surface tension / N·m-1
LBE 10 347.379 1.904×10-3 0.399 蒸汽 Vapor 0.379 2.029×10-5 —
Table 3. Boundary conditions of single heat transfer tube under crack condition
View tableView in ArticleTable 3. Boundary conditions of single heat transfer tube under crack condition
算例
Cases
LBE入口速度
Inlet velocity of LBE
/ m·s-1
裂纹位置
Location of cracks
LBE与传热管表面接触角
Contact Angle between LBE
with tube surface / (°)
蒸汽入口速度
Inlet velocity of vapor / m·s-1
1 0.25 顶部裂纹 Top crack 5.4 0.02 渗流射流蒸汽
Low-speed steam jet
2 0.25 顶部裂纹 Top crack 50 0.02 3 0.25 顶部裂纹 Top crack 90 0.02 4 0.25 顶部裂纹 Top crack 130 0.02 5 0.25 水平裂纹 Lateral crack 5.4 0.02 6 0.25 水平裂纹 Lateral crack 50 0.02 7 0.25 水平裂纹 Lateral crack 90 0.02 8 0.25 水平裂纹 Lateral crack 130 0.02 9 0.25 底部裂纹 Bottom crack 5.4 0.02 10 0.25 底部裂纹 Bottom crack 50 0.02 11 0.25 底部裂纹 Bottom crack 90 0.02 12 0.25 底部裂纹 Bottom crack 130 0.02 13 0.25 顶部裂纹 Top crack 5.4 0.5 低速射流蒸汽
Low-speed steam jet
14 0.25 水平裂纹 Lateral crack 5.4 0.5 15 0.25 底部裂纹 Bottom crack 5.4 0.5 16 0.25 顶部裂纹 Top crack 5.4 1 17 0.25 水平裂纹 Lateral crack 5.4 1 18 0.25 底部裂纹 Bottom crack 5.4 1 19 0.5 顶部裂纹 Top crack 5.4 0.5 20 0.5 水平裂纹 Lateral crack 5.4 0.5 21 0.5 底部裂纹 Bottom crack 5.4 0.5
Table 4. Boundary conditions of 3×3 tube bundle cracking
View tableView in ArticleTable 4. Boundary conditions of 3×3 tube bundle cracking
算例Cases LBE入口速度
Inlet velocity
of LBE / m·s-1
裂纹位置
Location of cracks
LBE与传热管表面接触角
Contact angle between LBE
with tube surface / (°)
蒸汽入口速度
Inlet velocity of vapor / m·s-1
22 0.25 顶部裂纹 Top crack 5.4 0.5 低速射流蒸汽
Low-speed steam jet
23 0.25 水平裂纹 Lateral crack 5.4 0.5 24 0.25 底部裂纹 Bottom crack 5.4 0.5
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Weijian DONG, Tenglong CONG, Junzhi ZHU, Yao XIAO, Xumao ZOU, Hanyang GU. Numerical simulation of steam bubble dynamics at microcrack in LBE descending flow field[J]. NUCLEAR TECHNIQUES, 2022, 45(12): 120605
Paper Information
Category: Research Articles
Received: Aug. 18, 2022
Accepted: --
Published Online: Jan. 3, 2023
The Author Email: CONG Tenglong (tlcong@sjtu.edu.cn)
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