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Heat transfer and pressure drop in single-phase turbulent flow inside internally helical-grooved horizontal small-diameter tubes.

Number: pap. ID: 632

Author(s) : INOUE N., ICHINOSE J.

Summary

An experimental study of pressure drop and heat transfer in single-phase turbulent flow inside internally helical-grooved small-diameter tube were carried out using ten different kinds of tubes and a smooth small-diameter tube with 4.00 mm outer diameter. The ranges of geometric parameters of test tube were number of grooves (40 to 50), helix angle (0 to 25°) and fin height (0.10 to 0.20 mm). In the experiments, the water was used as a test fluid; its inlet temperature was kept at a constant 20°C and the mass flow rate was varied from 0.016 to 0.048 kg/s. For these experiments, the electric heating capacity was adjusted in accordance with the same heat flux conditions as in the experiment conducted on a grooved tube with an outer diameter of 6.35 mm, and in a low mass flow rate region, the electric heating capacity was adjusted within a range where the difference between inlet and outlet temperatures in the experimental heat transfer section did not exceed 6 K. The effect of groove shape of an internally grooved small-diameter tube upon the pressure drop and heat transfer in the turbulent region was made clear, and those results were compared with the results of a grooved tube with an outer diameter of 6.35 mm.

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Pages: 8 p.

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Details

  • Original title: Heat transfer and pressure drop in single-phase turbulent flow inside internally helical-grooved horizontal small-diameter tubes.
  • Record ID : 30002233
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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