Published 18 issues per year
ISSN Print: 1064-2285
ISSN Online: 2162-6561
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AN EXPERIMENTAL STUDY OF BUBBLE FORMATION ON A MICROWIRE COATED WITH SUPERHYDROPHOBIC MICROPATTERNS
ABSTRACT
Surface physicochemical properties, including wettability and micro- and nanoscopic roughness, play an important role in boiling heat transfer. In the paper, we consider the bubble formation on a copper wire coated with superhydrophobic micropatterns. Distinctive non-wetted micropatterns were fabricated by the common soft lithography process integrated with a hydrophobic coating method (Larmour et al., 2007) that yields a double-roughness surface with the water contact angle larger than 170°. The width of each pattern was 100 µm and the pitch along the wire was 3 mm. Unlike the previous studies mostly conducted on flat surfaces, the micro-sized copper wire (150 µm in diameter) greatly facilitated the observation of the bubble dynamics details. Standard saturated pool boiling was conducted with a prior-degassing procedure. For comparison, the same boiling processes were conducted on a bare copper wire as well as a uniformly coated superhydrophobic wire. The bubble behaviors were visualized, and the advantages of the micropatterns in bubble distribution, nucleation and detachment were proved.
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Attinger Daniel, Frankiewicz Christophe, Betz Amy R., Schutzius Thomas M., Ganguly Ranjan, Das Arindam, Kim Chang-Jin, Megaridis Constantine M., Surface engineering for phase change heat transfer: A review, MRS Energy & Sustainability, 1, 1, 2014. Crossref
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Allred Taylor P., Weibel Justin A., Garimella Suresh V., Enabling Highly Effective Boiling from Superhydrophobic Surfaces, Physical Review Letters, 120, 17, 2018. Crossref