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
- NUCLEAR TECHNIQUES
- Vol. 45, Issue 12, 120605 (2022)
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. 9. Effect of increasing steam flow
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
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Table 1. Geometry parameters of computational domain
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Table 2. Properties of LBE and vapor
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Table 3. Boundary conditions of single heat transfer tube under crack condition
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Table 4. Boundary conditions of 3×3 tube bundle cracking
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