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 (2020) Drop evaporation on rough hot-spots: effect of wetting modes. Heat Transfer Engineering, 41 (19-20). pp. 1654-1662. 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 evaporator resting on 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-spots. 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 lower pinning energy based on an energy analysis. This study 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
Additional Information: Special Issue: Selected Papers from the 15th UK Heat Transfer Conference, September 4-5, 2017, Brunel University London, UK
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 07 Nov 2018 12:30
Last Modified: 12 Aug 2020 00:38
URI: https://ueaeprints.uea.ac.uk/id/eprint/68803
DOI: 10.1080/01457632.2019.1640458

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