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.
Original language | English |
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Pages (from-to) | 1654-1662 |
Number of pages | 9 |
Journal | Heat Transfer Engineering |
Volume | 41 |
Issue number | 19-20 |
Early online date | 12 Aug 2019 |
DOIs | |
Publication status | Published - Aug 2020 |
Profiles
-
Alex Askounis
- School of Engineering - Lecturer in Mechanical Engineering
Person: Academic, Teaching & Research