Direct transition phenomena in pool boiling of FC-72

Purwono F. Sutopo, Katsuya Fukuda, Qiusheng Liu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The direct transition boiling process from non-boiling to film boiling at critical heat flux (CHF) by exponentially increasing heat input, Q0exp(t/τ), was investigated in apool of FC-72. Investigations were made on a 1.0 mm diameter gold horizontal cylinder heater under a wide range of system pressures for saturated condition. Direct transition predominantly occurs from heat conduction process in the non-boiling regime by rapid increasing heat input and then followed by incipient boiling and CHF simultaneously. However, during quasi-steady-state heat transfer, it was observed that the direct transition also occurs from single phase natural convection at around atmospheric pressure and by an extent of pre-pressure, which was given to the cylinder surface at atmospheric pressure. Direct transition phenomena were confirmed to exist due to the explosive-like heterogeneous spontaneous nucleation (HSN) in originally flooded cavities on surface. The predictions of direct transition phenomena were also derived from typical incipient boiling superheat and CHF.

Original languageEnglish
Pages (from-to)206-221
Number of pages16
JournalJournal of Thermal Science and Technology
Issue number2
Publication statusPublished - 2010
Externally publishedYes


  • CHF
  • Direct transition
  • FC-72
  • Pre-pressure
  • Transient


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