The dynamics of bubble growth at medium-high superheat: Boiling in an infinite medium and on a wall

Herman D. Haustein, Alon Gany, Georg F. Dietze, Ezra Elias, Reinhold Kneer

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

At high superheat, bubble growth is rapid and the heat transfer is dominated by radial convection. This has been found, in the case of a droplet boiling within another liquid and in the case of a bubble growing on a heated wall, leading to similar bubble growth curves. Based on an experimental parametric study for the droplet-boiling case, an empirical model was developed for the prediction of bubble growth, within the radial convection dominated regime (the RCD model) occurring only at high superheat. This model suggests a dependence of R∼t1/3 -equivalent to a Nusselt number decreasing over time (Nu∼t-1/3), as opposed to R∼t1/2 -equivalent to a highly-unlikely constant Nusselt number, in most other models. The new model provides accurate prediction for both the droplet boiling and nucleate pool boiling cases, in the medium-high superheat range (0.26<Ste <0.41, 0.19<Ste<0.30, accordingly). By comparison, the new RCD model shows a more consistent prediction, than previous empirical models. However, in the nucleate boiling case, the RCD model requires the foreknowledge of the departure diameter, for which a reliable model still is lacking.

Original languageEnglish
Article number071501
JournalJournal of Heat Transfer
Volume135
Issue number7
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Bubble growth
  • Droplet boiling
  • Nucleate boiling
  • RCD model

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