Jure Berce (Author), Armin Hadžić (Author), Matevž Zupančič (Author), Matic Može (Author), Iztok Golobič (Author)

Abstract

Advanced superhydrophobic interfaces, where strong water repellency is imparted on top of micro- and nanoengineered surface features, have demonstrated enhanced boiling heat transfer with the potential to drastically improve the efficiency of thermal management. However, their practical deployment is impeded by degradation of favorable characteristics, resulting from thermo-chemo-physical strain during prolonged bubble or vapor patch formation. Building on extensive past work where the leading degradation mechanisms of long-term pool boiling were analyzed, a novel six-step surface engineering procedure is developed in this work to effectively mitigate boiling-induced degradation on superhydrophobic copper samples. Laser microengineering is coupled with a UV-ozone-activated gold nanolayer, upon which a fluorine-free monolayer is deposited to induce superhydrophobicity. The developed stochastically hierarchical interface repeatably demonstrates enhanced boiling heat transfer at low wall superheats with HTC improvements up to 460%, while its micromorphology and wetting remain intact even after several hundred hours of vigorous pool boiling. With practical implementation in mind, the interface is stress-tested at elevated temperatures and repeated CHF onsets, exhibiting unparalleled durability of wetting behavior and heat transfer stability. Through this work, it is sought to advance the practical application of superhydrophobicity, moving closer to realizing its full potential in advanced phase change cooling solutions.

Keywords

durability;heat transfer;hierarchical structures;laser texturing;long-termboiling;phase change cooling;superhydrophobicity;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 536.24:544.722.132
COBISS: 246074627 Link will open in a new window
ISSN: 2688-4062
Views: 79
Downloads: 51
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Other data

Secondary language: Slovenian
Secondary keywords: odpornost;prenos toplote;hierarhične strukture;lasersko teksturiranje;dolgotrajno vrenje;hlajenje s fazno spremembo;superhidrofobnost;
Type (COBISS): Article
Pages: str. 1-12
Issue: [Article no.] 2500326
Chronology: 2025
DOI: 10.1002/sstr.202500326
ID: 27125811