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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

SCALABLE-MANUFACTURING OF BIPHILIC CONDENSATION SURFACES WITH RANDOMIZED HYDROPHILIC NANO-BUMPS

Get access (open in a dialog) DOI: 10.1615/IHTC16.cod.023481
pages 2417-2423

摘要

Vapor condensation, which involves abundant latent heat exchange, plays a significant role in many industrial applications. From practical point of view, both the design of surface topographies and accessible fabrication technics of such surfaces need to be considered for the strategies of condensation heat transfer enhancement through surface engineering. In this work, we present a scalable yet simple manufacturing method for production of biphilic surfaces with randomized nanoscale hydrophilic bumps. The biphilic patterned topography is fabricated on an aluminum substrate where the nanoscale hydrophilic bumps that generated by electrospraying technology scatter thereon. The fabricated biphilic surface exhibits a heterogeneous wettability and distinct ability in nucleation control and enhancement. Remarkable improvement in condensation as compared to nanostructured superhydrophobic surfaces was observed in terms of both droplet number density and droplet self-departure ability, which can be attribute to the synergistic action of fast nucleation recurrence and frequent droplet departure. In a 6-hour water harvesting test in a chamber with air humidity of ~40%, the biphilic aluminum plate achieved around threefold increment in water collection rate as compared to a homogeneous superhydrophobic surface. We believe our novel technique offers an accessible approach for manufacturing biphilic surfaces for industrial applications like water harvesting or dehumidification.