Experimental study of wall nucleation characteristics in flow boiling under subatmospheric pressures in a vertical square channel

Nathan Colgan, Joseph L. Bottini, Zhiee Jhia Ooi, Caleb Brooks

Research output: Contribution to journalArticlepeer-review

Abstract

Experiments have been conducted in a vertical square channel to investigate wall nucleation characteristics in subcooled boiling flows under subatmospheric pressure. The objective of this work is to provide a unique dataset to evaluate the scalability of existing models of nucleation characteristics for flow boiling conditions below atmospheric pressure as the performance of these models has not been investigated under these conditions. The experimental data is presented as a parametric study of the effects of important dimensionless groups on nucleation characteristics, specifically boiling number, Jakob number, and density ratio. Bubble departure diameters and departure frequencies are measured and compared to existing models. Some existing models are shown to predict departure diameter well but mainly overpredict departure frequency at low pressure.

Original languageEnglish (US)
Pages (from-to)58-68
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume134
DOIs
StatePublished - May 2019

Keywords

  • Boiling
  • Forced convection
  • Nucleation
  • Subatmospheric

ASJC Scopus subject areas

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

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