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Surface irregularity effects of droplets and retained condensate on local heat transfer to finned tubes in crossflow.

Author(s) : HU X., ZHANG L., JACOBI A. M.

Summary

Using a mass transfer analogy, the authors conducted experiments with simulated condensate and found an enhancement in spatially averaged heat transfer as high as 33% over dry behaviour. True fin efficiencies, however, were found to be as much as 13% below the Gardner (uniform heat transfer coefficient) fin efficiencies, due to local variations in the convection coefficient. Local behaviour is dominated by small horseshoe vortices associated with the droplets or surface irregularities, and these structures are responsible for the heat transfer enhancement.

Details

  • Original title: Surface irregularity effects of droplets and retained condensate on local heat transfer to finned tubes in crossflow.
  • Record ID : 1995-2143
  • Languages: English
  • Source: Heat pumps in cold climates. Proceedings of the second international technical conference.
  • Publication date: 1994
  • Document available for consultation in the library of the IIR headquarters only.

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