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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

SELF-CLEANING PROPERTIES VIA CONDENSATION ON SUPERHYDROPHOBIC SURFACES

David Miller
Brigham Young University, Provo, Ut, 84602

Julie Crockett
Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093-0411, U.S.A.; Department of Mechanical Engineering, Brigham Young University, Provo, Utah, 84602

Fred Lane
Moxtek, Inc, Orem, 84057

Daniel Maynes
Brigham Young University, 435 Crabtree Building, Provo, Utah 84602, United States

Brian D. Iverson
Brigham Young University, 435 Crabtree Building, Provo, Utah 84602, United States

Abstract

Recent research regarding superhydrophobic (SH) surfaces has been focused on the principles of condensation on SH surfaces and the self-cleaning properties exhibited by SH surfaces. This research seeks to combine and expand these two aspects of SH surfaces to investigate the efficiency of self-cleaning properties during condensation. These SH surfaces are created by a combination of a SH chemical coating and nano-rib structure. Surfaces were contaminated with sea salt, tobacco residue, and pollen, placed in a controlled humid environment, and cooled below the dew point temperature. Condensed microdroplets were allowed to grow and coalesce large enough to roll off the surface, removing from the surface all other condensed droplets in its path and ideally all contaminates in that same path. The static contact angle (CA) and sliding angle (SA) were measured before and after each condensation cycle and compared to the CA and SA of a clean surface that had gone through similar condensation cycles. This data was used to then approximate the cleaning efficiency of the SH surface. Furthermore, these measurements were compared to the CA and SA of contaminated surfaces after a single droplet and multiple droplets rolled over the surface. From this study, we determine that depending on the contaminate, condensed droplets that roll off a contaminated SH surface is a viable way to remove contaminates from that SH surface.

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