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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

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Judd,  R. L., and Hwang,  K. S., 1976, “A Comprehensive Model for Nucleate Pool Boiling Heat Transfer Including Microlayer Evaporation,” Int. J. Heat Mass Transf., 98, pp. 623–629.
Ivery,  H. J., 1967, “Relationship Between Bubble Frequency, Departure Diameter, and Rise Velocity in Nucleate Boiling,” Int. J. Heat Mass Transf., 10, pp. 1023–1040.
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Torikai, K., Hori, M., Akiyama, M., Kobori, T., and Adachi, H., 1964, “Boiling Heat Transfer and Burn Out Mechanism in Boiling Water Cooled Reactor,” Third United Nations International Conference on the Peaceful Uses of Atomic Energy,” Paper No. 28/P580.
Wang,  C. H., and Dhir,  V. K., 1993, “Effect of Surface Wettability on Active Nucleation Site Density During Pool Boiling of Saturation Water,” J. Heat Transfer, 115, pp. 659–669.
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Mandelbrot, B. B., 1982, The Fractal Geometry of Nature, W. H. Freeman, New York.
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Figures

Grahic Jump Location
(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).
Grahic Jump Location
Fractal dimension versus wall superheat for ϕ=35 deg, 90 deg
Grahic Jump Location
Area fraction Vs of nucleation sites versus wall superheat for ϕ=35 deg, 90 deg
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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.
Grahic Jump Location
(a) Area fraction for natural convection versus wall superheat for ϕ=35 deg, 90 deg; and (b) Natural convection coefficient versus wall superheat.
Grahic Jump Location
Effects of contact angle and fractal dimension on boiling heat flux at ΔTw=10°C
Grahic Jump Location
Effects of contact angle on maximum and minimum diameters of nucleation sites
Grahic Jump Location
Effects of contact angle on total number of nucleation sites

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