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Research on the mechanism of laminar heat transfer in pipes and enhanced heat transfer effect based on thermal resistance analysis
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Weiying ZHANG1, Liqin CHEN2, Yuwen JIA1
Thermal Power Generation | 2023, 52(7) : 119 - 125
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Thermal Power Generation | 2023, 52(7): 119-125
• Intelligent management technologies for coal-fired power plants •
Research on the mechanism of laminar heat transfer in pipes and enhanced heat transfer effect based on thermal resistance analysis
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Weiying ZHANG1, Liqin CHEN2, Yuwen JIA1
Affiliations
  • 1.China Institute of Automatic Energy, Department of Nuclear Engineering Design, Beijing 102413, China
  • 2.China Institute of Automatic Energy, Reactor Engineering Technology Research Institute, Beijing 102413, China
Published: 2023-07-25 doi: 10.19666/j.rlfd.202302025
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The analysis of heat and mass transfer process has important guiding significance for the performance improvement of heat and mass transfer equipment. Through the analysis of the thermal resistance in the boundary layer, the author explores the development of the convective thermal resistance and thermal conduction thermal resistance in the laminar flow of the pipeline in the boundary layer, and establishes a mechanism model (R-P model) that conforms to the macroscopic characterization. The thermal resistance distribution law under the condition of Re and Pr, explored the internal mechanism of laminar flow enhanced heat transfer in the tube, and guided the optimal design of the flow-around structure. The results show that the heat conduction is absolutely dominant in the inlet stage, and the proportion of convection gradually increases after the full development. The mechanism of Re and Pr affecting heat transfer is different. When Re increases, the heat transfer must be strengthened. When Pr increases, it only increases the proportion of convection, and in the range of (Pr<1.8), thermal resistance always plays a major role. At the same time, it was found that adding a turbulent flow structure to the laminar flow in the pipeline would reduce the heat transfer effect.

convective heat transfer mechanism  /  thermal resistance analysis model  /  thermal resistance distribution law  /  enhanced convective heat transfer optimization
Weiying ZHANG, Liqin CHEN, Yuwen JIA. Research on the mechanism of laminar heat transfer in pipes and enhanced heat transfer effect based on thermal resistance analysis[J]. Thermal Power Generation, 2023 , 52 (7) : 119 -125 . DOI: 10.19666/j.rlfd.202302025
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Year 2023 volume 52 Issue 7
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Article Info
doi: 10.19666/j.rlfd.202302025
  • Receive Date：2023-02-27
  • Online Date：2026-01-26
  • Published：2023-07-25
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  • Received：2023-02-27
Affiliations
    1.China Institute of Automatic Energy, Department of Nuclear Engineering Design, Beijing 102413, China
    2.China Institute of Automatic Energy, Reactor Engineering Technology Research Institute, Beijing 102413, China
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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
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
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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