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<p>This work investigates the heat transfer of low GWP alternative refrigerant mixture R448A inside multiport mini-channel tubes through both numerical and experimental method. The measured heat transfer coefficient through experiments will be analysed to evaluate the effect of mass flux, and heat flux toward the heat transfer coefficient. A correlation will be provided as a basis for comparison with Computational data. A new mass transfer model for non-azeotropic mixture was developed and applied to simulate the boiling mechanism of R448A. The CFD model is validated through comparison with correlation, while the void fraction is compared against flow pattern observation. Finally, through the mass fraction field, the preference of boiling of more volatile components is shown, which result in the elevation of the bubble points, as well as a layer of mass transfer resistance adjacent to the wall penalizing the evaporation process.</p>

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Flow boiling of R448 A inside mini-channel: an integrated experimental and computational investigation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月14日

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  • Hieu Ngoc Hoang,
  • Jong-Taek Oh,
  • Jong-Kyu Kim

摘要

This work investigates the heat transfer of low GWP alternative refrigerant mixture R448A inside multiport mini-channel tubes through both numerical and experimental method. The measured heat transfer coefficient through experiments will be analysed to evaluate the effect of mass flux, and heat flux toward the heat transfer coefficient. A correlation will be provided as a basis for comparison with Computational data. A new mass transfer model for non-azeotropic mixture was developed and applied to simulate the boiling mechanism of R448A. The CFD model is validated through comparison with correlation, while the void fraction is compared against flow pattern observation. Finally, through the mass fraction field, the preference of boiling of more volatile components is shown, which result in the elevation of the bubble points, as well as a layer of mass transfer resistance adjacent to the wall penalizing the evaporation process.