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Effect of fin geometries on condensation heat transfer and pressure drop inside horizontal small-diameter 4 mm microfin tubes.

Number: pap. 2511

Author(s) : INOUE N., HIROSE M., JIGE D.

Summary

This study experimentally investigated the condensation heat transfer and pressure drop characteristics of R1234ze(E) inside horizontal small-diameter 4.0 mm OD microfin tubes having three different types of fin geometries. The specifications of the three fin geometries were 40 fins with a fin height of 0.18 mm and a helix angle of 18°, 50 fins with a fin height of 0.15 mm and a helix angle of 12°, and 50 fins with a fin height of 0.12 mm and a helix angle of 25°. The experiments were carried out for a range of mass velocities from 50 to 400 kgm-2s-1, and at a saturation temperature of 35 °C. The effects of fin geometries such as the number of fins, fin height, and helix angle on the heat transfer and pressure drop were investigated. The heat transfer coefficient increased as the number of fins increased for the lowest mass velocity. Fin height was most effective on heat transfer enhancement at higher mass velocities. The heat transfer coefficient and pressure drop of the microfin tubes were compared with those of smooth tube and were evaluated in terms of the enhancement factor of heat transfer. The measured heat transfer coefficient and pressure drop were compared with previous correlations, and the results were verified practical effectiveness of the previous correlations for small-diameter microfin tubes.

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Pages: 8

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Details

  • Original title: Effect of fin geometries on condensation heat transfer and pressure drop inside horizontal small-diameter 4 mm microfin tubes.
  • Record ID : 30024589
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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