Measurement of contribution of microlayer evaporation applying the microlayer volume change during nucleate pool boiling for water and ethanol

•Microlayer evaporation was studied using laser interferometric method during nucleate boiling.•Microlayer evaporation was analyzed based on the volume variation of microlayers.•The crest-like structure of initial microlayer was observed for water and ethanol.•Microlayer evaporation occupied a signi...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:International journal of heat and mass transfer 2018-10, Vol.125, p.243-247
Hauptverfasser: Utaka, Yoshio, Hu, Kang, Chen, Zhihao, Morokuma, Takayuki
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:•Microlayer evaporation was studied using laser interferometric method during nucleate boiling.•Microlayer evaporation was analyzed based on the volume variation of microlayers.•The crest-like structure of initial microlayer was observed for water and ethanol.•Microlayer evaporation occupied a significant ratio of the total evaporation. The formation of microlayer beneath boiling bubbles during nucleate pool boiling has been confirmed by many researchers. The vigorous evaporation of the microlayer plays an important role in boiling heat transfer, because of the high thermal conductance of the micron-order thickness of liquid film. However, the experimental knowledge on the microlayer evaporation has been limited owing to the difficulty of measuring the evaporation. In this study, the laser interferometric method was adopted to investigate the microlayer structure during the nucleate pool boiling for ethanol. The microlayer evaporation was determined from the variation of microlayer volume. As a result, it was confirmed that microlayer evaporation contributes significantly to total evaporation, and that its contribution ratio coincided with the previous results.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2018.04.044