Abstract
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Article Information:
A New Analytical Model for High Heat Flux in Pool Boiling
Guoping Jiang; Boqi Xiao and Jichao Liu
Corresponding Author: guoping jiang
Submitted: March 10, 2012
Accepted: March 24, 2012
Published: October 01, 2012 |
Abstract:
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In this study, first the empirical correlations and primary models of Critical Heat Flux (CHF) are
introduced, then a new fractal model for critical heat flux is proposed. Algebraic expressions for the fractal
dimension of nucleation sites are derived based on the fractal distribution of nucleation sites, which are shown
to be a strong function of wall superheat. The new fractal model for critical heat flux is found to be a function
of wall superheat. The contact angel of the fluid and the physical properties of the fluid and empirical constant
have an important effect on critical heat flux. It turns out that the present model well explains the mechanism
on how parameter such as surface wettability influences CHF. The present model shows the surface wettability
plays no significant role. The expressions of active nucleation site are applies to CHF which are predicted in
the proposed model quantitatively. The predicted critical heat flux from a boiling surface based on the proposed
fractal model is compared with existing experimental data. An excellent agreement between the new model
predictions and experimental data is found. The validity of the new fractal model is thus verified.
Key words: Critical heat flux, fractal model, heat transfer rates, pool boiling, thermodynamics, ,
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Cite this Reference:
Guoping Jiang; Boqi Xiao and Jichao Liu, . A New Analytical Model for High Heat Flux in Pool Boiling. Research Journal of Applied Sciences, Engineering and Technology, (19): 3760-3767.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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