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Measurement and modelling of condensation heat transfer in non-circular microchannels.

Author(s) : AGARWAL A., BANDHAUER T. M., GARIMELLA S.

Type of article: Article, IJR article

Summary

The thermal amplification technique developed and reported in earlier work by the authors is used to measure the heat transfer coefficients across the vapour-liquid dome in small increments of vapour quality. Results from previous work by the authors on condensation flow mechanisms in microchannel geometries were used to interpret the results based on the applicable flow regimes. The effect of tube shape was also considered in deciding the applicable flow regime. A modified version of the annular-flow-based heat transfer model proposed recently by the authors for circular microchannels, with the required shear stress being calculated from a non-circular microchannel pressure drop model also reported earlier was found to best correlate the present data for square, rectangular and barrel-shaped microchannels. For the other microchannel shapes with sharp acute-angle corners, a mist-flow-based model from the literature on larger tubes was found to suffice for the prediction of the heat transfer data. These models predict the data significantly better than the other available correlations in the literature.

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Pages: pp. 1169-1179

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Details

  • Original title: Measurement and modelling of condensation heat transfer in non-circular microchannels.
  • Record ID : 2010-0737
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 33 - n. 6
  • Publication date: 2010/09

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