Heat transfer performance during condensation inside spiralled micro-fin tubes

Jean Pierre M. Bukasa, Leon Liebenberg, Josua P. Meyer

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of the spiral angle on the heat transfer performance in micro-fin tube condensers has not yet been clearly established because other geometric parameters affecting the heat transfer performance were simultaneously varied in previous studies. This paper reports on the influence of the spiral angle on the heat transfer during condensation inside spiralled micro-fin tubes having all other geometric parameters constant. Tests were conducted for condensation of R-22, R-134a, and R-407C inside a smooth (9.52 mm outer diameter) and three micro-fin tubes with approximately the same diameter, having spiral angles of 10 deg, 18 deg, and 37 deg, respectively. Experimental results indicated a heat transfer augmentation with spiral angle increase. A new semi-empirical predictive correlation was developed for practical design of spiralled micro-fin tubes. The proposed new correlation predicted the majority of experimental results of the present study within a deviation zone of ±20%.

Original languageEnglish (US)
Pages (from-to)321-328
Number of pages8
JournalJournal of Heat Transfer
Volume126
Issue number3
DOIs
StatePublished - Jun 1 2004
Externally publishedYes

Keywords

  • Condensation
  • Enhancement
  • Finned surfaces
  • Heat transfer

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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