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Effects of hydrophilic surface treatment on evaporation heat transfer on the outside wall of horizontal tubes.

Author(s) : KIM H. Y., KANG B. H.

Type of article: Article

Summary

An experimental study has been conducted to investigate the effects of hydrophilic surface treatment on evaporative heat transfer on the outside wall of various kinds of copper tubes. Plain, spiral, corrugated, and low-finned tubes were selected as tubes to be tested. In this work, to increase the wettability of distilled water on copper tubes, a novel hydrophilic surface treatment method using plasma was employed. The experiments show that all types of hydrophilic surface treated tubes tested in the work exhibit superior evaporation heat transfer performance than untreated tubes. It was found that during the evaporation process, the high wettability of the surface obtained through hydrophilic treatment induces film flow on the tubes, while sessile drops are formed on untreated tubes. The heat-transfer rate is higher for the tubes with a hydrophilic surface than in the case of untreated tubes. This phenomenon is due to the thinner film on treated tubes; the latter provides a greater heat-transfer area.

Details

  • Original title: Effects of hydrophilic surface treatment on evaporation heat transfer on the outside wall of horizontal tubes.
  • Record ID : 2003-1712
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 23 - n. 4
  • Publication date: 2003/03

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