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Advanced micro-fin tubes for evaporation.

Author(s) : CHAMRA L. M., WEBB R. L.

Type of article: Article

Summary

The new geometries include both single-helix and cross-grooved surfaces. The single-groove geometries have 74-80 internal fins, 0.35-mm fin height, and 30 degree fin included angle. The cross-groove geometries are formed by applying a second set of grooves at the same helix angle, but opposite angular direction as the first set. Data are provided for varying second groove depths. For evaporation of R22, the highest performance was provided by a cross-grooved tube having 20 deg helix angle. Its evaporation coefficient is 23% higher than an existing 75 groove, single-helix tube. The pressure drop is 6% higher than in the 75 groove tube. Reduced performance occurs in the cross-grooved tube when the second groove depth exceeds 60% of the depth of the first set of grooves.

Details

  • Original title: Advanced micro-fin tubes for evaporation.
  • Record ID : 1997-0176
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 39 - n. 9
  • Publication date: 1996/06

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