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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Investigation of Decisive Mixture Effects in Nucleate Boiling of Binary Mixtures Using a Theoretical Model

[+] Author and Article Information
Jürgen Kern, Peter Stephan

Chair of Technical Thermodynamics, Darmstadt University of Technology, Petersenstrasse 30, 64287 Darmstadt, Germany

J. Heat Transfer 125(6), 1116-1122 (Nov 19, 2003) (7 pages) doi:10.1115/1.1622716 History: Received August 05, 2002; Revised August 26, 2003; Online November 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Single bubble subsystem and significant phenomena in the micro region
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Comparison of computational results with data from experiments 5 and correlations 678 of the binary mixture ethane/propane for different compositions (p*=0.1, q̇m=4×103 W/m2)
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Liquid film thickness and heat flux in the micro region of the binary mixture propane/n-butane (yl,1,bulk=0.063, p*=0.2, Tout−Tsat=7,87 K, ξads=0.016 mm, r=0.05 mm)
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Liquid and vapor mass fraction of the more volatile component propane as well as saturation temperature in the micro region of the binary mixture propane/n-butane (yl,1,bulk=0.063, p*=0.2, Tout−Tsat=7,87 K, ξads=0.016 mm, r=0.05mm)
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Ratio of diffusive to convective mass flow of the more volatile component propane in the micro region of the binary mixture propane/n-butane (yl,1,bulk=0.063, p*=0.2, Tout−Tsat=7,87 K, ξads=0.016 mm, r=0.05 mm)
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Ratio of pressure gradient due to Marangoni convection and total pressure gradient in the micro region of the binary mixture propane/n-butane (yl,1,bulk=0.063, p*=0.2, Tout−Tsat=7,87 K, ξads=0.016 mm, r=0.05 mm)
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Velocity profiles in the micro region of the binary mixture propane/n-butane (yl,1,bulk=0.063, p*=0.2, Tout−Tsat=7,87 K, ξads=0.016 mm, r=0.05 mm)
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Liquid vapor phase equilibrium diagrams of zeotropic and azeotropic mixtures. Classified with regard to the sign of the difference between liquid and vapor mole fraction at equilibrium.
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Ratio of heat flow Q̇mic considering selected effects and heat flow Q̇mic(xl=const.) assuming constant liquid composition in the micro region of the binary mixture propane/n-butane (p*=0.2, q̇m=2×104 W/m2, r=dA/4)
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Liquid film thickness and heat flux in the micro region of the binary mixture propane/n-butane considering selected effects (yl,1,bulk=0.198, p*=0.2, Tout−Tsat=7,87 K, r=0.043mm)
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Calculated bubble radii versus time of the binary mixture propane/n-butane (yl,1,bulk=0.667, p*=0.2, Tout−Tsat=7,87 K)
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Variation of decisive mixture effects. Calculated heat transfer coefficients of the binary mixture ethane/propane for different compositions (p*=0.1, q̇m=4×103 W/m2)
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Bubble site density and departure diameter of the binary mixture ethane/propane for different compositions (p*=0.1, q̇m=4×103 W/m2)
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Variation of decisive mixture effects. Calculated heat transfer coefficients of the binary mixture propane/n-butane for different compositions (p*=0.2, q̇m=2×104 W/m2).
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Bubble site density and departure diameter of the binary mixture propane/n-butane for different compositions (p*=0.2, q̇m=2×104 W/m2)

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