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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

A Fractal Model for Nucleate Pool Boiling Heat Transfer

[+] Author and Article Information
Boming Yu, Ping Cheng

Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China

J. Heat Transfer 124(6), 1117-1124 (Dec 03, 2002) (8 pages) doi:10.1115/1.1513580 History: Received September 26, 2001; Revised June 14, 2002; Online December 03, 2002
Copyright © 2002 by ASME
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References

Figures

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(a) A photograph 8 of active nucleation sites for ϕ=90 deg, q=5.7×105 W/m2, and ΔTw=18°C; and (b) determination of fractal dimension of nucleation sites from (a).
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Fractal dimension versus wall superheat for ϕ=35 deg, 90 deg
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Area fraction Vs of nucleation sites versus wall superheat for ϕ=35 deg, 90 deg
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Effects of contact angle on maximum and minimum diameters of nucleation sites
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Effects of contact angle on total number of nucleation sites
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A comparison between the fractal model prediction and experimental data of nuclear pool-boiling heat flux: (a) ϕ=90 deg, (b) ϕ=35 deg.
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(a) Area fraction for natural convection versus wall superheat for ϕ=35 deg, 90 deg; and (b) Natural convection coefficient versus wall superheat.
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Effects of contact angle and fractal dimension on boiling heat flux at ΔTw=10°C

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