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Boiling heat transfer in mini-channels: influence of the hydraulic diameter.

Author(s) : AGOSTINI B., BONTEMPS A., WATEL B., et al.

Summary

The present experimental study shows how the reduction of the hydraulic diameter affects the heat transfer coefficient for a boiling flow in mini-channels. Flat aluminium multiport extruded tubes composed of parallel rectangular channels with hydraulic diameters 0.77 and 2.01 mm were used with refrigerant R134a. It was shown that the reduction of the hydraulic diameter increased the heat transfer coefficient and favoured dry-out, probably because of the thinning of the liquid layer due to the bubble confinement. However it was found that the quality averaged heat transfer coefficient was still greater than what would be obtained in macro-tubes.

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Details

  • Original title: Boiling heat transfer in mini-channels: influence of the hydraulic diameter.
  • Record ID : 2004-1079
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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