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Development of a general correlation for heat transfer in single-phase turbulent flow inside internally helical-grooved tubes.

Author(s) : INOUE N., GOTO M.

Summary

An experimental study of heat transfer in single-phase turbulent flow inside an internally helical-grooved tube was carried out using thirteen different kinds of grooved tubes and a smooth tube with 6.35 mm outer diameter and 1000 mm working length. The range of geometric parameters of grooved test tubes were number of grooves (45 to 65), helix angle (10 to 35°) and fin height (0.15 to 0.3 mm). In the experiments, each of test tubes was heated at constant heat input of 1.4 kW by an electric heater. The inlet cooling water temperature was kept between 16 and 18°C, and the flow rate was varied from 0.03 to 0.11 kg/s. The obtained data indicated that heat transfer coefficients were from 110 to 200% higher than those of smooth tube and increased with increasing the ratio of inner surface area of grooved tube to that of smooth tube and helix angle, while decreased with increasing the number of grooves. The correlations to predict the heat transfer coefficients were developed based on the measured data, which predicted the experimental data within plus or minus 20% and correlated the data reported in literature within plus or minus 30%.

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Pages: ICR07-B1-225

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Details

  • Original title: Development of a general correlation for heat transfer in single-phase turbulent flow inside internally helical-grooved tubes.
  • Record ID : 2007-2522
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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