In this research, a method for fabricating controlled micro-scale, anisotropic topographical features on aluminum is described for the purpose of exploiting those features to affect the surface wettability. Experimental data have shown that droplets placed on these micro-grooved aluminum surfaces using a micro-syringe exhibit an increased apparent contact angle, and for droplets condensed on these etched surfaces, up to a 50% reduction in the volume needed for the onset of droplet sliding is manifest. No chemical surface treatment is necessary to achieve this water repellency; it is accomplished solely by the anisotropic surface morphology that manipulates droplet geometry and creates and exploits discontinuities in the three-phase contact line. In an effort to provide guidance for the development of these surfaces, a mechanistic model for droplet retention on micro-grooved aluminum surfaces will also be presented. This work will show that current models, tacitly based on an assumption of isotropic wetting, do not provide reliable prediction of water retention on these new surfaces.
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ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
August 10–14, 2008
Jacksonville, Florida, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4848-7
PROCEEDINGS PAPER
Modeling the Retention of Water Droplets on Topographically-Modified, Micro-Grooved Aluminum
Andrew D. Sommers,
Andrew D. Sommers
Miami University, Oxford, OH
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Anthony M. Jacobi
Anthony M. Jacobi
University of Illinois - Urbana-Champaign, Urbana, IL
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Andrew D. Sommers
Miami University, Oxford, OH
Anthony M. Jacobi
University of Illinois - Urbana-Champaign, Urbana, IL
Paper No:
HT2008-56440, pp. 317-326; 10 pages
Published Online:
July 7, 2009
Citation
Sommers, AD, & Jacobi, AM. "Modeling the Retention of Water Droplets on Topographically-Modified, Micro-Grooved Aluminum." Proceedings of the ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. Heat Transfer: Volume 2. Jacksonville, Florida, USA. August 10–14, 2008. pp. 317-326. ASME. https://doi.org/10.1115/HT2008-56440
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