TY - JOUR
T1 - Drop evaporation on rough hot-spots: effect of wetting modes
AU - Zhang, Huacheng
AU - Kita, Yutaku
AU - Zhang, Dejian
AU - Nagayama, Gyoko
AU - Takata, Yasuyuki
AU - Sefiane, Khellil
AU - Askounis, Alexandros
N1 - Special Issue: Selected Papers from the 15th UK Heat Transfer Conference, September 4-5, 2017, Brunel University London, UK
PY - 2020/8
Y1 - 2020/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85070815945&partnerID=8YFLogxK
U2 - 10.1080/01457632.2019.1640458
DO - 10.1080/01457632.2019.1640458
M3 - Article
SN - 0145-7632
VL - 41
SP - 1654
EP - 1662
JO - Heat Transfer Engineering
JF - Heat Transfer Engineering
IS - 19-20
ER -