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Volume 49 Issue 11
Nov.  2023
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Journal of Beijing University of Aeronautics and Astronautics  > 2023  >  49(11): 2929-2937.
WANG Y H，LU Y N，LI H W，et al. Influence and criterion of buoyancy force on heat transfer of supercritical CO2 in a vertical helical tube[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（11）：2929-2937 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0024
Citation: WANG Y H，LU Y N，LI H W，et al. Influence and criterion of buoyancy force on heat transfer of supercritical CO2 in a vertical helical tube[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（11）：2929-2937 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0024
shu

Influence and criterion of buoyancy force on heat transfer of supercritical CO2 in a vertical helical tube

doi: 10.13700/j.bh.1001-5965.2022.0024
  • 1.

    School of Energy and Power Engineering，Northeast Electric Power University，Jilin 132012，China

  • 2.

    School of Energy and Power Engineering，Dalian University of Technology，Dalian 116024，China

Funds:  National Natural Science Foundation of China (51576027)；Scientific Research Project of Jilin Provincial Education Department (JJKH20220100KJ); Young Doctoral Research Project of Northeast Electric Power University (BSZT02202102)
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  • Corresponding author: E-mail：lihongwei@neepu.edu.cn
  • Received Date: 17 Jan 2022
  • Accepted Date: 01 May 2022
  • Publish Date: 09 Jun 2022
    Abstract

  • Numerical research was done on the heat transmission of supercritical CO2 in a vertical helical tube based on the cooling heat transfer in the aeroengine intercooler. The influence mechanisms of the operating parameters on heat transfer along the flow and circumferential directions were investigated. The distributions of the temperature field and flow field in tube cross-sections were used to describe the circumferential non-uniform heat transmission mechanism generated by the buoyancy force and centrifugal force. The secondary flow velocity and intensity were analyzed. According to the tube structure characteristics, the reasonable buoyancy parameter and buoyancy criteria were proposed, and the new heat transfer correlation was obtained. The results show that the centrifugal force predominates in the tube downstream while the buoyancy force and centrifugal force combine to provide non-uniform heat transfer in the tube upstream. When the buoyancy factor Bu≥1.6×10−5 is satisfied, the buoyancy force plays a leading role in heat transfer. The new heat transfer correlation can better predict the heat transfer in the helical tube.

     

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