The two-phase flow instability in parallel channels heated by uniform and non-uniform heat flux has been theoretically studied in this paper. Based on the homogeneous flow model in two-phase region, the system control equations of parallel channels were established. Semi-implicit finite-difference method and staggered mesh method were used to discretize the system control equations and the difference equations were solved with a chasing method. The cosine profile and uniform constant heat flux represent the non-uniform and uniform heating condition, respectively. The marginal stability boundaries (MSB) of parallel channels and the three-dimensional instability spaces (or instability reefs) of different heat flux models were obtained. For cosine profile heating, the stability of parallel channels increases with the increase of the system pressure and inlet resistant coefficient. In high inlet subcooling region, cosine heat flux can strengthen the system stability. However, in low inlet subcooling region, the negative effect to system stability will be caused by non-uniform heating. The increase of inlet resistant coefficient will move the turning point of the MSB to high inlet subcooling number.
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2013 21st International Conference on Nuclear Engineering
July 29–August 2, 2013
Chengdu, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5581-2
PROCEEDINGS PAPER
The Influence of Non-Uniform Heating on Two-Phase Flow Instability in Parallel Channels
Xiaodong Lu,
Xiaodong Lu
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Linglan Zhou,
Linglan Zhou
Nuclear Power Institute of China, Chengdu, Sichuan, China
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Hong Zhang,
Hong Zhang
Nuclear Power Institute of China, Chengdu, Sichuan, China
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Yingwei Wu,
Yingwei Wu
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Guanghui Su,
Guanghui Su
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Suizheng Qiu
Suizheng Qiu
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Xiaodong Lu
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Linglan Zhou
Nuclear Power Institute of China, Chengdu, Sichuan, China
Hong Zhang
Nuclear Power Institute of China, Chengdu, Sichuan, China
Yingwei Wu
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Guanghui Su
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Suizheng Qiu
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Paper No:
ICONE21-15231, V004T09A022; 8 pages
Published Online:
February 7, 2014
Citation
Lu, X, Zhou, L, Zhang, H, Wu, Y, Su, G, & Qiu, S. "The Influence of Non-Uniform Heating on Two-Phase Flow Instability in Parallel Channels." Proceedings of the 2013 21st International Conference on Nuclear Engineering. Volume 4: Thermal Hydraulics. Chengdu, China. July 29–August 2, 2013. V004T09A022. ASME. https://doi.org/10.1115/ICONE21-15231
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