Experimental Study of Bubble Distribution Characteristics in a 10×10 Rod Bundle Subchannel Based on Mask R-CNN

Sun Niujia; Zhang Heng; Hang Qin; Wang Wencong; Liu Caixue; Zhang Peilai; Li Jiayi; Wang Xiangfan

doi:10.13832/j.jnpe.2024.090054

Volume 46 Issue 5

Oct. 2025

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Article Navigation > Nuclear Power Engineering > 2025 > 46(5): 243-248

Sun Niujia, Zhang Heng, Hang Qin, Wang Wencong, Liu Caixue, Zhang Peilai, Li Jiayi, Wang Xiangfan. Experimental Study of Bubble Distribution Characteristics in a 10×10 Rod Bundle Subchannel Based on Mask R-CNN[J]. Nuclear Power Engineering, 2025, 46(5): 243-248. doi: 10.13832/j.jnpe.2024.090054

Citation:

Sun Niujia, Zhang Heng, Hang Qin, Wang Wencong, Liu Caixue, Zhang Peilai, Li Jiayi, Wang Xiangfan. Experimental Study of Bubble Distribution Characteristics in a 10×10 Rod Bundle Subchannel Based on Mask R-CNN[J]. Nuclear Power Engineering, 2025, 46(5): 243-248. doi: 10.13832/j.jnpe.2024.090054

Citation:

Sun Niujia, Zhang Heng, Hang Qin, Wang Wencong, Liu Caixue, Zhang Peilai, Li Jiayi, Wang Xiangfan. Experimental Study of Bubble Distribution Characteristics in a 10×10 Rod Bundle Subchannel Based on Mask R-CNN[J]. Nuclear Power Engineering, 2025, 46(5): 243-248. doi: 10.13832/j.jnpe.2024.090054

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Experimental Study of Bubble Distribution Characteristics in a 10×10 Rod Bundle Subchannel Based on Mask R-CNN

doi: 10.13832/j.jnpe.2024.090054

1.
College of Computer Science and Technology, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China
2.
Nuclear Power Institute of China, Chengdu, 610213, China
3.
Nuclear Power Operations Research Institute, Shanghai, 200120, China

Received Date: 2024-09-14
Rev Recd Date: 2025-03-06

Available Online: 2025-10-15

Publish Date: 2025-10-15

Abstract

Abstract

The rod bundle structure is widely used in critical equipment such as reactor cores and steam generators, and the geometric and physical parameters of the bubbles in their subchannels play a crucial role in the numerical prediction of mass transfer and heat transfer processes. This paper conducts an experimental study on the air-water two-phase flow behavior in the subchannels of a 10×10 rod bundle, using high-speed imaging combined with Mask R-CNN to investigate the effects of gas flow rate and nozzle diameter at different heights on bubble size, shape, and void fraction. The results show that under the constraint of narrow gaps, approximately 45% of the bubbles maintain a stable ellipsoidal shape. When the nozzle diameter reaches 0.3 mm, about 30% of the bubbles undergo significant deformation. Due to the limited gap space, the bubble diameter peaks around 2 mm, but as the gas flow rate and nozzle diameter increase, the bubble generation frequency rises, and the void fraction increases accordingly. During the bubble ascent, the diameter slightly increases, but the bubble number decreases along the axis, ultimately leading to a reduction in the void fraction.
- Two-phase flow,
- Rod bundle channel,
- Bubble parameter distribution,
- Deep learning,
- Void fraction

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References(16)

References

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