A simple model is presented for estimating the ratio of the maximum to minimum cavity radius required for ebullition in two-phase flow with heat transfer. The resulting dimensionless parameter, rmax/rmin, is demonstrated to correlate flow boiling nucleation site density. As the convective heat transfer associated with bulk turbulence in two-phase flow is enhanced, rmax→rmin, and the probability of finding surface cavities whose radii lie between rmaxandrmin is reduced. Thus, active nucleation sites become deactivated. A vertical flow boiling facility was fabricated in which the nucleation suppression point can be measured. Experiments conducted for mass flux ranging from 183–315 kg/m2-s and inlet quality ranging from 0–0.151, along with data available from the literature, suggest that rmax/rmin is the leading order dimensionless parameter on which the complete suppression of nucleation sites depends. Although the suppression of nucleation sites also depends, to a certain extent, on the surface/fluid combination and heat flux, it is found that complete suppression occurs for rmax/rmin ranging from 40 to 120. This is proposed as a criterion to discriminate the purely convective regime from the nucleate boiling regime.
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e-mail: klaus@nersp.nerdc.ufl.edu
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Research Papers
Suppression of Flow Boiling Nucleation
G. E. Thorncroft,
G. E. Thorncroft
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611-6300
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J. F. Klausner,
J. F. Klausner
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611-6300
e-mail: klaus@nersp.nerdc.ufl.edu
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R. Mei
R. Mei
Department of Aerospace Engineering, Mechanics, and Engineering Science, University of Florida, Gainesville, FL 32611-6250
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G. E. Thorncroft
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611-6300
J. F. Klausner
Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611-6300
e-mail: klaus@nersp.nerdc.ufl.edu
R. Mei
Department of Aerospace Engineering, Mechanics, and Engineering Science, University of Florida, Gainesville, FL 32611-6250
J. Heat Transfer. Aug 1997, 119(3): 517-524 (8 pages)
Published Online: August 1, 1997
Article history
Received:
June 18, 1996
Revised:
February 24, 1997
Online:
December 5, 2007
Citation
Thorncroft, G. E., Klausner, J. F., and Mei, R. (August 1, 1997). "Suppression of Flow Boiling Nucleation." ASME. J. Heat Transfer. August 1997; 119(3): 517–524. https://doi.org/10.1115/1.2824130
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