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A generalized thermal deviation factor to evaluate the comprehensive stress of tubes under non-uniform heating

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  • Li, X.L.
  • Li, G.X.
  • Tang, G.H.
  • Fan, Y.H.
  • Yang, D.L.

Abstract

The heaters working with supercritical fluids normally suffer from high temperature, high pressure and non-uniform heating, which would lead to thermal fragile and stress failure in practical engineering. However, efficient and accurate methods to predict the comprehensive stress in non-uniformly heating tubes are missing. Besides, to reduce the comprehensive stress, a criterion is required to provide optimization guidance of non-uniformly heating tubes. In present study, the thermal and mechanical performances of three typical non-uniformly heating tubes are numerically investigated using the FVM-FEM method. A generalized thermal deviation factor (GTDF) is then proposed. The results showed that the GTDF can accurately predict the ratio of comprehensive stress to yield strength and GTDF > 1 indicates the plastic deformation, which is much more convenient and efficient than the conventional structural analysis. Based on the GTDF, two methods of reducing heat flux non-uniformity and enhancing tube-inside heat transfer are proposed to reduce the comprehensive stress. The results show that the unilaterally elliptic dimpled tube reduces the maximum comprehensive stress by 30.8% compared with the smooth tube and also prevents the stress concentration in the dimple zone, which can be employed to reduce the comprehensive stress in various tubes under non-uniformly heating conditions.

Suggested Citation

  • Li, X.L. & Li, G.X. & Tang, G.H. & Fan, Y.H. & Yang, D.L., 2023. "A generalized thermal deviation factor to evaluate the comprehensive stress of tubes under non-uniform heating," Energy, Elsevier, vol. 263(PA).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pa:s0360544222025968
    DOI: 10.1016/j.energy.2022.125710
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