In a special boiling cell, vapor bubbles are generated at single nucleation sites on top of a thick stainless steel heating foil. An infrared camera captures the rear side of the heating foil for analyzing the temperature distribution. The bubble shape is recorded through side windows with a high-speed camera. Global measurements were conducted, with the pure fluids FC-84 and FC-3284 and with its binary mixtures of 0.25, 0.5, and fraction. The heat transfer coefficient (HTC) in a binary mixture is less than the HTC in either of the single component fluid alone. Applying the correlation of Schlünder showed good agreement with the measurements (1982, “Über den Wärmeübergang bei der Blasenverdampfung von Gemischen,” Verfahrenstechnik, 16(9), pp. 692–698). Furthermore, local measurements were arranged with high lateral and temporal resolution for single bubble events. The wall heat flux was computed and analyzed, especially at the three-phase-contact line between liquid, vapor, and heated wall. The bubble volume and the vapor production rate were also investigated. For pure fluids, up to 50–60% of the latent heat flows through the three-phase-contact region. For mixtures, this ratio is clearly reduced and is about 35%.
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December 2009
This article was originally published in
Journal of Heat Transfer
Research Papers
High-Resolution Measurements at Nucleate Boiling of Pure FC-84 and FC-3284 and Its Binary Mixtures
Peter Stephan
Peter Stephan
Department of Mechanical Engineering, Institute of Technical Thermodynamics,
e-mail: pstephan@ttd.tu-darmstadt.de
Technische Universität Darmstadt
, D-64287 Darmstadt, Germany
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Enno Wagner
Peter Stephan
Department of Mechanical Engineering, Institute of Technical Thermodynamics,
Technische Universität Darmstadt
, D-64287 Darmstadt, Germanye-mail: pstephan@ttd.tu-darmstadt.de
J. Heat Transfer. Dec 2009, 131(12): 121008 (12 pages)
Published Online: October 15, 2009
Article history
Received:
February 15, 2008
Revised:
January 12, 2009
Published:
October 15, 2009
Citation
Wagner, E., and Stephan, P. (October 15, 2009). "High-Resolution Measurements at Nucleate Boiling of Pure FC-84 and FC-3284 and Its Binary Mixtures." ASME. J. Heat Transfer. December 2009; 131(12): 121008. https://doi.org/10.1115/1.3220143
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