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Heat transfer enhancement in heat exchangers.

Author(s) : OHADI M. M.

Type of article: Article

Summary

The author describes heat tranfer augmentation by the electrohydrodynamic (EHD) technique. In this, a very small, but high voltage current is passed between electrodes to produce electrically induced secondary motions at the heat transfer surface. These increase turbulence and destabilize the thermal boundary layer. Resultant heat transfer is increased, up to a hundred times in some circumstances. Increases in pressure drop are considerably less. The technique has been applied to single phase and mixed phase flow in various heat exchange situations, e.g., transformer oil cooling, R114 refrigerant condenser. The apparatus is cheap and much simpler than mechanical enhancement methods. D.W.H.

Details

  • Original title: Heat transfer enhancement in heat exchangers.
  • Record ID : 1992-2635
  • Languages: English
  • Source: ASHRAE Journal - vol. 33 - n. 12
  • Publication date: 1991/12
  • Document available for consultation in the library of the IIR headquarters only.

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