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Effect of viscous dissipation on the optimization of the heat transfer in internally finned tubes.

Author(s) : FABBRI G.

Type of article: Article

Summary

In this article, the effect of viscous dissipation on the heat transfer in a finned tube cooled by a fluid in laminar flow was studied under the condition of imposed heat flux. In particular, the alterations induced by viscous dissipation in the optimum finned tube geometries were investigated. To this aim, the velocity and temperature distributions on the finned tube cross-section were determined with the help of a finite element model which takes the effect of viscous dissipation into account. Moreover, a global heat transfer coefficient was calculated. After having assigned a polynomial lateral profile to the fins of the tube, the geometry was then optimized in order to maximize the heat transferred per unit of tube length for a given weight and for a given hydraulic resistance in correspondence with different intensities of viscous dissipation. Lastly, the differences between the optimum geometries obtained under different conditions of viscous dissipation were analysed.

Details

  • Original title: Effect of viscous dissipation on the optimization of the heat transfer in internally finned tubes.
  • Record ID : 2005-0094
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 14-16
  • Publication date: 2004/07

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