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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/32135

Title: Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots
Authors: Zhao, Huayong
Williams, Andrew M.
Keywords: Critical heat flux
Pool boiling
Hydrodynamic instability
Contact angle
Pressure
Issue Date: 2018
Publisher: © Elsevier
Citation: ZHAO, H. and WILLIAMS, A.M., 2018. Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots. International Journal of Multiphase Flow, 104, pp.174-187.
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.
Description: This paper is closed access until 7 March 2019.
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/32135
Publisher Link: https://doi.org/10.1016/j.ijmultiphaseflow.2018.02.021
ISSN: 0301-9322
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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