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A Study on the Mechanism of Convective Heat Transfer Enhancement Based on Heat Convection Velocity Analysis

Author

Listed:
  • Hui Xiao

    (School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Zhimin Dong

    (School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Rui Long

    (School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Kun Yang

    (School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Fang Yuan

    (School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

This paper explores the mechanism of convective heat transfer enhancement in a new perspective. In this paper, a new parameter called heat convection velocity is proposed based on the field synergy principle. It is defined as the velocity projection on the temperature gradient vector and reflects the magnitude of the velocity component that contributes to heat convection. Three typical cases are taken into consideration to investigate the influence factors of Nusselt number theoretically. The results indicate that the Nusselt number can be enhanced by increasing the mean heat convection velocity and the dimensionless mean temperature difference. Through theoretical analysis, three suggestions are found for designing heat transfer enhancement components: (a) the overall synergetic effect should be improved; (b) the fluid with lower temperature gradient should be guided to the region where the temperature gradient is higher; (c) temperature distribution should be an interphase distribution of hot and cold fluid. Besides, the heat convection velocity is used to investigate the mechanism of convective heat transfer in the smooth tube. It is found that the increase of Nusselt number is due to the increase of heat convection velocity. In addition, according to design suggestions, a new insert is invented and inserted in the circular tube. With heat convection velocity analysis, it is found that there is much potential of increasing heat convection velocity for enhancing the convective heat transfer in the circular tube.

Suggested Citation

  • Hui Xiao & Zhimin Dong & Rui Long & Kun Yang & Fang Yuan, 2019. "A Study on the Mechanism of Convective Heat Transfer Enhancement Based on Heat Convection Velocity Analysis," Energies, MDPI, vol. 12(21), pages 1-22, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4175-:d:282546
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    References listed on IDEAS

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    Cited by:

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    2. Ozen Gunal & Mustafa Akpinar & Kevser Ovaz Akpinar, 2022. "Optimization of Laminar Boundary Layers in Flow over a Flat Plate Using Recent Metaheuristic Algorithms," Energies, MDPI, vol. 15(14), pages 1-20, July.

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