Drop evaporation on rough hot-spots: effect of wetting modes

Zhang, Huacheng, Kita, Yutaku, Zhang, Dejian, Nagayama, Gyoko, Takata, Yasuyuki, Sefiane, Khellil and Askounis, Alexandros (2019) Drop evaporation on rough hot-spots: effect of wetting modes. Heat Transfer Engineering. ISSN 0145-7632

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Abstract

Hot-spots are a common occurrence in power electronics which become increasingly hotter as chips become denser. Novel cooling technologies are emerging to cope with this increasing heat load, which imbed a condenser to supply cooling drops to the hot-spots. Nonetheless, the evaporation process of the drops has been overlooked. Here, we conducted a series of experiments to understand how the evaporation and motion of drops are influenced by the wetting mode of rough hot-spot. We fabricated three different surfaces exhibiting full (Wenzel) or partial (Cassie-Baxter) wetting and the hot-spot is imposed by laser irradiation. We report a direct link between drop motion and wetting mode with the partial wetting drops being highly mobile, attributable to the lowest pinning energy and interpret based on an energy analysis. This work provides a framework for future modifications in hot-spot cooling to account for drop motion which should greatly influence the overall heat removal performance.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
Depositing User: LivePure Connector
Date Deposited: 07 Nov 2018 12:30
Last Modified: 03 Nov 2019 20:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/68803
DOI: 10.1080/01457632.2019.1640458

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