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research-article

Correction for the hydrodynamic instability based critical heat flux models ? effects of viscosity and heating surface size

[+] Author and Article Information
Huayong Zhao

Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, United Kingdom
h.zhao2@lboro.ac.uk

Colin P. Garner

Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, United Kingdom
C.P.Garner@Lboro.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4039911 History: Received October 18, 2017; Revised March 26, 2018

Abstract

This paper presents the corrections for existing hydrodynamic instability based Critical Heat Flux (CHF) models in pool boiling by taking into account the effect of the viscosity, geometry and size of the liquid-vapour interface. Based on the existing literature, the Kelvin - Helmholtz theory used by the most commonly adopted CHF models can lead to noticeable errors when predicting the instability conditions. This is due to neglecting the effects of fluids viscosity and its oversimplification of the interface geometry. In addition, the literature suggests the most unstable condition predicted by the Viscous Correction for Viscous Potential Flow (VCVPF) theory for cylindrical interface best matches the observed vapour column breakup condition. In this paper, the most unstable instability conditions predicted by the VCVPF theory are used to correct for the existing CHF models. The comparison between the existing and corrected CHF models suggests the corrected models always predict a higher CHF value. In addition, the corrected Zuber model predicts similar CHF value to the Lienhard and Dhir model. Comparison with experimental data suggests the corrections to the Zuber's model can increase its prediction accuracy in most cases, but not necessary for the Lienhard and Dhir model. When compared to experimental CHF data for boiling cryogens at different pressures, the introduced corrections consistently help to improve the accuracy of both the Zuber model and the Lienhard and Dhir model.

Copyright (c) 2018 by ASME
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