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Experimental and numerical studies on pressure drop characteristic curve under hypergravity.

Author(s) : LI C., FANG X., LUO Z., YANG Q., CHEN Z.

Type of article: IJR article

Summary

Given that the onset of flow instability (OFI) and the negative slope steepness of the pressure drop characteristic curve (N-shaped curve) are key factors determining boiling flow system stability, this paper establishes a theoretical model suitable for analyzing the appearance of negative slope in the N-shaped curve. Combined with experimental data, the influence of different experimental parameters on the N-shaped curve is clarified. The results show that the negative slope steepness increases with the increase of inlet subcooling, and the influence of heat flux on the negative slope is relatively small. As pressure decreases, the negative slope becomes relatively accentuated. As the gravity level increases, the negative slope of the curve gradually slows down, and OFI appears at lower mass fluxes, indicating that hypergravity is beneficial for enhancing the stability of the boiling system and delaying the occurrence of boiling flow instability. In addition, the pressure drop prediction method and steps suitable for hypergravity environments have been constructed. This method simplifies the flow state components of the working fluid in the tube, and introduces parameters related to hypergravity and boiling.

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Pages: 25-37

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Details

  • Original title: Experimental and numerical studies on pressure drop characteristic curve under hypergravity.
  • Record ID : 30033534
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 171
  • Publication date: 2025/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2024.12.015

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