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Study on thermal hydraulic performance of supercritical carbon dioxide in semi-circular channel with variable cross-section
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Bin PENG, Zhenhao SUN, Bingguo ZHU, Jiabao SHI, Pengcheng ZHANG
Thermal Power Generation | 2024, 53(4) : 43 - 52
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Thermal Power Generation | 2024, 53(4): 43-52
• Thermal energy science research •
Study on thermal hydraulic performance of supercritical carbon dioxide in semi-circular channel with variable cross-section
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Bin PENG, Zhenhao SUN, Bingguo ZHU, Jiabao SHI, Pengcheng ZHANG
Affiliations
  • School of Mechanical & Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Published: 2024-04-25 doi: 10.19666/j.rlfd.202310165
Outline
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The mathematical and physical models of different semicircular channels are established, and the accuracy of the numerical models is verified by comparing with the experimental data. The thermal and hydraulic heat transfer performance of supercritical carbon dioxide (S-CO2) in uniform cross-section semicircular tube, diverging tube and converging tube is studied, and the influence of different channels and pressures on the thermal and hydraulic performance of S-CO2 in a semi-circular tube with variable cross-section is calculated and analyzed. The results show that, compared with the uniform cross-section semicircular tube, the diverging tube deteriorates heat transfer, the converging tube enhances heat transfer. The overall heat transfer coefficient of converging semicircular tube with the inlet and outlet radius ratio of 1.0:0.5 increases by 39.93%, and the maximum evaluation factor PEC of flow heat transfer comprehensive performance is 1.346. When the pressure is closer to the critical pressure or the heat flux is low, the heat transfer performance is higher. Finally, the reason why the converging tube with variable cross-section can enhance heat transfer is explained from the perspective of field coordination and turbulent kinetic energy distribution. The research results can provide new ideas and theoretical guidance for the design and optimization of coolers in S-CO2 circulation system.

supercritical carbon dioxide  /  diverging tube  /  converging tube  /  heat transfer enhancement  /  turbulent flow  /  field coordination
Bin PENG, Zhenhao SUN, Bingguo ZHU, Jiabao SHI, Pengcheng ZHANG. Study on thermal hydraulic performance of supercritical carbon dioxide in semi-circular channel with variable cross-section[J]. Thermal Power Generation, 2024 , 53 (4) : 43 -52 . DOI: 10.19666/j.rlfd.202310165
Funding
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  • National Natural Science Foundation of China(51966009)
  • Natural Science Foundation of Gansu Province(22JR5RA283)
  • Excellent Doctoral Program of Gansu Province(22JR5RA235)
Appendix
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Year 2024 volume 53 Issue 4
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76
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Article Info
doi: 10.19666/j.rlfd.202310165
  • Receive Date：2023-10-19
  • Online Date：2026-03-06
  • Published：2024-04-25
Article Data
Affiliations
History
  • Received：2023-10-19
Funding
National Natural Science Foundation of China(51966009)
Natural Science Foundation of Gansu Province(22JR5RA283)
Excellent Doctoral Program of Gansu Province(22JR5RA235)
Affiliations
    School of Mechanical & Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202310165
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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