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Investigation of forced convection heat exchanger in flat-oval channels with profiled surface.

Author(s) : RIFERT V. G., SHAVRIN Y. V., ILIEV I. D.

Summary

The paper presents an experimental investigation results of the convective heat exchange during water flow in flat-oval channels with various width-height ratio. To intensify the heat exchange wider channel sides were profiled with diametrical semi-cylindrical fins (symmetrical and nonsymmetrical). Various fin pitch with the same fin height h=2 mm were used. The investigation of average heat transfer coefficients in channels showned that profiled surfaces intensified heat exchange process 1.3-2.5 times (dependently on channel geometry) compared with smooth channels. The fin location (symmetrical or non-symmetrical) on opposite channel sides does not affect heat exchange. The experimental data has been correlated by the Nusselt = f(Reynolds) equations for every channel size and fin parameter with 5% precision. Different criterion equations for heat exchange in channels were suggested for ranges surface/diameter smaller than 1.15 and higher than 1.15. Simultaneously with heat exchange investigation, pressure drop was measured and equation for friction factor calculation was suggested. Geometrical channel parameters, for which heat exchange increase prevails over pressure drop rise, were determined.

Details

  • Original title: Investigation of forced convection heat exchanger in flat-oval channels with profiled surface.
  • Record ID : 1997-0736
  • Languages: English
  • Source: Proceedings of the 2nd European Thermal-Sciences (EUROTHERM) and 14th UIT National Heat Transfer Conference 1996.
  • Publication date: 1996/05/29
  • Document available for consultation in the library of the IIR headquarters only.

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