In this work a model for the mechanism of dropwise condensation on ion implanted metallic surfaces is proposed. Considering experimental results for respective surfaces, the model is based on droplet nucleation and growth on preferably wetted, elevated precipitates, resulting in short-term steam entrapment after droplet coalescence. According to wetting theory this transition state yields increased macroscopic contact angles enabling dropwise condensation. Open condensation phenomena like enlarging dropwise condensation areas in spite of increasing condensation rate become comprehensible by our approach. Furthermore, the model points out that contact angles and surface free energies measured under ambient air conditions are not usable for predicting the condensation form of steam on the modified surfaces. Although the suggested microscopic mechanism cannot be directly proved by experiment, its capability of explaining experimental observations colliding with previous theoretical approaches supports its validity. The results also reveal that dropwise condensation of steam can originate from microscopically different mechanisms.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4937-8
PROCEEDINGS PAPER
Mechanism of Dropwise Condensation on Ion Implanted Metallic Surfaces
Michael H. Rausch,
Michael H. Rausch
University of Erlangen-Nuremberg, Erlangen, Germany
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Alfred Leipertz,
Alfred Leipertz
University of Erlangen-Nuremberg, Erlangen, Germany
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Andreas P. Fro¨ba
Andreas P. Fro¨ba
University of Erlangen-Nuremberg, Erlangen, Germany
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Michael H. Rausch
University of Erlangen-Nuremberg, Erlangen, Germany
Alfred Leipertz
University of Erlangen-Nuremberg, Erlangen, Germany
Andreas P. Fro¨ba
University of Erlangen-Nuremberg, Erlangen, Germany
Paper No:
IHTC14-22149, pp. 25-29; 5 pages
Published Online:
March 1, 2011
Citation
Rausch, MH, Leipertz, A, & Fro¨ba, AP. "Mechanism of Dropwise Condensation on Ion Implanted Metallic Surfaces." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 2. Washington, DC, USA. August 8–13, 2010. pp. 25-29. ASME. https://doi.org/10.1115/IHTC14-22149
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