CHF-Transition Boiling

Hiroto Sakashita*, Takaharu Tsuruta, Niro Nagai, Shoji Mori, Masahiro Shoji, Yoshihiko Haramura, Hiroyasu Ohtake, Wei Liu, Hisashi Umekawa, Yasuo Koizumi, Shinichi Morooka

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingChapter

    2 Citations (Scopus)


    This chapter deals with topics on critical heat flux (CHF) point and transition boiling in aspects of heat-transfer mechanisms based on both model simulations and measurements of each authors' research in recent decades. First three sections report heat-transfer modeling on CHF based on measurements and visualization results; i.e., macrolayer dryout model (Section 3.1), microlayer evaporation model (Section 3.2), and contact-line-length density model (Section 3.3). Section 3.4 demonstrates unique surface structures for enhancement of CHF. The following three sections cover other aspects of CHF and transition boiling mechanisms. Section 3.5 reports unified explanations for heater size dependence of CHF. Section 3.6 shows unique characteristics of transition boiling, i.e., negative differential resistance, and focuses on uniformity of surface temperature and heat flux during transition boiling. Section 3.7 discusses liquid-solid contact fraction in transition boiling region and derives correlation for transition boiling curve. The last four sections deal with CHF in flow boiling conditions. Section 3.8 discusses CHF triggering mechanisms and prediction methods in subcooled flow boiling. Section 3.9 shows influence of flow oscillation on convective boiling phenomena. Section 3.10 reports relation between appearance of dry patches and CHF in forced flow boiling. The last section 3.11 focuses on boiling transition phenomena and CHF for boiling water reactor (BWR) fuel assembly.

    Original languageEnglish
    Title of host publicationBoiling
    Subtitle of host publicationResearch and Advances
    Number of pages224
    ISBN (Electronic)9780081011171
    ISBN (Print)9780081010105
    Publication statusPublished - 2017 Jun 21


    • CHF
    • CHF enhancement
    • CHF model
    • Transition boiling

    ASJC Scopus subject areas

    • Engineering(all)


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