A hydrodynamic critical heat flux model for saturated pool boiling on a downward facing curved heating surface

1997 ◽  
Vol 40 (6) ◽  
pp. 1291-1302 ◽  
Author(s):  
F.B. Cheung ◽  
K.H. Haddad
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Pool Boiling ◽  
Heating Surface ◽  
Flux Model ◽  
Heat Flux Model

An Improved Theoretical Critical Heat Flux Model for Low-Quality Flow

1989 ◽  
Vol 88 (3) ◽  
pp. 294-306 ◽  
Author(s):  
Wen-Shan Lin ◽  
Chien-Hsiung Lee ◽  
Bau-Shei Pei
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Flux Model ◽  
Heat Flux Model

A Theoretical Critical Heat Flux Model for Rod Bundles Under Pressurized Water Reactor Conditions

1989 ◽  
Vol 85 (2) ◽  
pp. 213-226 ◽  
Author(s):  
Wen-Shan Lin ◽  
Bau-Shei Pei ◽  
Chien-Hsiung Lee ◽  
I. A. Mudawwar
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Pressurized Water Reactor ◽  
Rod Bundles ◽  
Pressurized Water ◽  
Water Reactor ◽  
Flux Model ◽  
Heat Flux Model

Pool boiling performance of oxide nanofluid on a downward-facing heating surface

Kerntechnik ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhibo Zhang ◽  
Huai-En Hsieh ◽  
Yuan Gao ◽  
Shiqi Wang ◽  
Jia Gao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Surface Roughness ◽  
Stainless Steel ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Critical Heat Flux ◽  
Pool Boiling ◽  
Heating Surface ◽  
Nano Particles

Abstract In this study, the pool boiling performance of oxide nanofluid was investigated, the heating surface is a 5 × 30 mm stainless steel heating surface. Three kinds of nanofluids were selected to explore their critical heat flux (CHF) and heat transfer coefficient (HTC), which were TiO2, SiO2, Al2O3. We observed that these nanofluids enhanced CHF compared to R·O water, and Al2O3 case has the most significant enhancement (up to 66.7%), furthermore, the HTC was also enhanced. The number of bubbles in nanofluid case was relatively less than that in R·O water case, but the bubbles were much larger. The heating surface was characterized and it was found that there were nano-particles deposited, and surface roughness decreased. The wettability also decreased with the increase in CHF.

scholarly journals Corrections for the Hydrodynamic Instability-Based Critical Heat Flux Models in Pool Boiling—Effects of Viscosity and Heating Surface Size

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Huayong Zhao ◽  
Colin P. Garner
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Hydrodynamic Instability ◽  
Pool Boiling ◽  
Heating Surface ◽  
Inviscid Flow ◽  
Unstable Condition ◽  
Viscous Potential Flow ◽  
Air Column ◽  
Interface Geometry

This paper presents 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–vapor interface. Based on the existing literature, the Kelvin–Helmholtz (KH) theory, used by the most commonly adopted CHF models, can lead to noticeable errors when predicting the instability conditions. The errors are mainly due to the inaccuracy of the inviscid flow assumptions and the 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 the cylindrical interfaces best match the observed air column breakup conditions in water. In this paper, the most unstable instability conditions predicted by the VCVPF theory are used to correct the existing CHF models. The comparison between the existing and corrected CHF models suggests that 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. The comparison with experimental data suggests that the correction to the Zuber 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 corrected CHF models are consistently more accurate than the original CHF models.

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