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Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012005689
pages 59-70

AN EXPERIMENTAL STUDY OF BUBBLE FORMATION ON A MICROWIRE COATED WITH SUPERHYDROPHOBIC MICROPATTERNS

Xinwei Wang
Laboratory of Heat and Mass Transport at Micro-Nano Scale, Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing, 100871 China
Yongxin Song
Department of Marine Engineering, Dalian Maritime University, Dalian, 116026 China
Hao Wang
Laboratory of Heat and Mass Transport at Micro-Nano Scale, College of Engineering, Peking University, Beijing 100871, China

RESUMO

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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