Dynamics of boiling succeeding spontaneous nucleation on a rapidly heated small surface

Kunito Okuyama, Shoji Mori, Kimihiro Sawa, Yoshihiro Iida

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The dynamics of boiling succeeding spontaneous nucleation on a small film heater immersed in ethyl alcohol are investigated at heating rates ranging from 107 K/s to approximately 109 K/s, under which spontaneous nucleation is dominant for the inception of boiling. Immediately after the concurrent generation of a large number of fine bubbles, a vapor film that covers the entire surface is formed by coalescence and rapidly expands to a single bubble. As the heating rate is increased, the coalesced bubble flattens and only a thin vapor film grows before cavitation collapse. Similar behaviors are also observed for water. Based on the observed results, a theoretical model of the dynamic bubble growth due to the self-evaporation of the superheated liquid layer, which develops before boiling incipience, is presented. The calculated results are compared with the observed results.

Original languageEnglish
Pages (from-to)2771-2780
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume49
Issue number15-16
DOIs
Publication statusPublished - Jul 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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