Boiling heat transfer characteristics with highly wettable heated surface under forced convection conditions

Toru Mitsutake, Fumihisa Kano, Tetsuo Oosato, Akio Sayano, Miyuki Akiba, Shinichi Morooka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Under forced convection and atmospheric pressure conditions, heat transfer characteristics were studied using an annulus channel of a heater rod with highly-wettable surface. Improvement of phase change heat transfer under boiling and condensation process requires that either liquid heated or vapor cooled can contact a heat transfer surface effectively, but either a vapor layer or a liquid film can be formed repeatedly on the surface during boiling and condensation processes. As oxide semiconductor materials are known to be highly wettable, TiO2 was coated on a heater rod surface. The Leidenfrost temperature for the TiO2 coated surface was higher than that for the uncoated surface. Under mass flux conditions from 600 to 1700kg/m2s, the heater rod surface temperature at variable power conditions was measured. A higher heat flux at the point where the forced convection vaporization started and a larger critical heat flux were observed for the TiO2 coated surface than that for the uncoated surface.

Original languageEnglish
Pages (from-to)168-172
Number of pages5
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume47
Issue number2
DOIs
Publication statusPublished - 2004 May
Externally publishedYes

Keywords

  • Critical heat flux
  • Forced convection
  • Oxide semiconductor coating
  • Wettable heater surface

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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