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IIR document

Influence of finned and porous structures in nucleate boiling of the hydrocarbon n-pentane.

Number: 0486

Author(s) : DEEB M., MARGRAF H., LUKE A.

Summary

The industry has increasing interest in a consistent database of the heat transfer of finned and enhanced surfaces in evaporators. Nucleate boiling is the most effective heat transfer mechanism. The prediction methods for the heat and mass transfer in boiling are critically reviewed for new applications. The heat transfer is presented for boiling n-pentane as an example for natural refrigerants for intermediate pressure as well as a wide range of heat flux on the outside of plain and finned tubes of copper and stainless steel, respectively. The copper tube with a special porous surface is provided for additional enhancement of the heat transfer. The experimental results for the plain copper surface agree quite well to semi-empirical correlations for nucleate boiling, while the material influence is overestimated. The enhancement for the finned tube is low. Convective boiling is not observed on the porous surface. The heat transfer in nucleate boiling is separated in two parts, dependent on the heat flux for the lower one, and independent from intermediate to high heat fluxes until to the critical heat flux.

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Pages: 11 p.

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Details

  • Original title: Influence of finned and porous structures in nucleate boiling of the hydrocarbon n-pentane.
  • Record ID : 30031617
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0486

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