Share

IIR document

Convective boiling pressure drop of refrigerant R134a in horizontal smooth and microfin tubes.

Author(s) : BANDARRA FILHO E. P., SAIZ JABARDO J. M., BARBIERI P. E. L.

Type of article: Article, IJR article

Summary

This study deals with the pressure drop of refrigerant R134a under convective boiling conditions in horizontal smooth and microfinned ('grooved') copper tubes. Experiments were carried out using an experimental set-up developed for phase-change studies with a test section made out of 7.0, 7.93, and 9.52 mm external diameter, 1.5 m long copper tubes, electrically heated by tape resistors wrapped on the external surface. Mass velocities and refrigerant qualities varied in the following ranges: 70-1100 kg/s.m2 and 5-95%. The annular flow pattern was observed to occur over most of the operational conditions. For smooth tubes, the Jung and Radermacher correlation for the liquid two-phase flow multiplier fits with reasonable precision the experimental data. As for grooved tubes, a correlation of the two phase flow multiplier in terms of Martinelli's parameter was developed and fits the data with an average absolute deviation of the order of 6.3%. The proposed correlation fits with good precision data obtained elsewhere for grooved tubes of different diameters and microfin geometries.

Available documents

Format PDF

Pages: 895-903

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Convective boiling pressure drop of refrigerant R134a in horizontal smooth and microfin tubes.
  • Record ID : 2005-0560
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 8
  • Publication date: 2004/12

Links


See other articles in this issue (21)
See the source

Indexing