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Heat transfer enhancement of a Stirling engine heating tube with three-pronged slant rods under oscillatory flow

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  • Xin, Feng
  • Tang, Bin
  • Zhao, Bin
  • Yang, Yanfeng
  • Liu, Wei
  • Liu, Zhichun

Abstract

Heaters are crucial components in Stirling engines, where the working medium adsorbed heat from an external heat source. Enhancing heat transfer within the heater is essential for boosting the operational efficiency of the Stirling engine. In this study, a tube equipped with three-pronged slant rods was employed to improve the heat transfer within the heater under conditions of oscillatory flow. Three pairs of dynamic longitudinal vortices were generated and exhibited regular movement patterns with distinct phase angles. In comparison to the smooth tube configuration, the enhanced tube outlet exhibited a notable increase in the average working-medium temperature by 62 K and 46 K during the entry and return stages, respectively. The degree of heat transfer enhancement was found to be contingent upon the pitch, height, and inclination angle of the slant rod. Optimal heat transfer enhancement was achieved with slant rods featuring a pitch of 26 mm, a height of 3.5 mm, and an inclination angle of 45°. The performance evaluation criterion ranged from 1.29 to 1.81 of enhanced tube compared to smooth tube. These findings underscore the effective enhancement of heat transfer facilitated by the three-pronged slant rods within the Stirling engine's heater.

Suggested Citation

  • Xin, Feng & Tang, Bin & Zhao, Bin & Yang, Yanfeng & Liu, Wei & Liu, Zhichun, 2024. "Heat transfer enhancement of a Stirling engine heating tube with three-pronged slant rods under oscillatory flow," Energy, Elsevier, vol. 301(C).
    • Handle: RePEc:eee:energy:v:301:y:2024:i:c:s0360544224014804
    DOI: 10.1016/j.energy.2024.131707
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