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Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots
Zhao, Huayong Williams, Andrew
Zhao, Huayong
Williams, Andrew
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2018-03-07
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Abstract
A new model, based on the experimental observation reported in the literature
that CHF is triggered by the Irreversible Hot Spots (IHS), has been developed to
predict the Critical Heat Flux (CHF) in pool boiling. The developed Irreversible
Hot Spot (IHS) model can predict the CHF when boiling methanol on small flat
surfaces and long horizontal cylinders of different sizes to within 5% uncertainty.
It can also predict the effect of changing wettability (i.e. contact angle) on CHF
to within 10% uncertainty for both hydrophilic and hydrophobic surfaces. In
addition, a linear empirical correlation has been developed to model the bubble
growth rate as a function of the system pressure. The IHS model with this linear
bubble growth coefficient correlation can predict the CHF when boiling water on
both flat surfaces and long horizontal cylinders to within 5% uncertainty up to 10 bar system pressure, and the CHF when boiling methanol on a flat surface to
within 10% uncertainty up to 5 bar. The predicted detailed bubble grow and
merge process from various sub-models are also in good agreement with the
experimental results reported in the literature.
Citation
Zhao, H., & Williams, A. (2018). Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots. International Journal of Multiphase Flow, 104, 174-187. https://doi.org/10.1016/j.ijmultiphaseflow.2018.02.021
Publisher
Elsevier
Journal
International Journal of Multiphase Flow
Research Unit
DOI
10.1016/j.ijmultiphaseflow.2018.02.021
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Article
Language
en
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ISSN
0301-9322