Boiling-induced surface aging and crystallization fouling of functionalized smooth and laser-textured copper interfaces

Berce, Jure (author), Arhar, Klara (author), Hadžić, Armin (author), Zupančič, Matevž (author), Može, Matic (author), Golobič, Iztok (author)

Long-term boiling stability marks an important and often overlooked characteristic when engineering advanced interfaces for efficient phase-change heat removal. This study presents long-term pool boiling on functionalized smooth and laser-textured copper interfaces in de-ionized water and in an aqueous solution of calcium sulphate. Each surface was exposed to nucleate boiling for several hundred hours and wettability, morphology and surface chemistry were evaluated prior to and after each test. In addition, consecutive pool boiling curves were recorded on all samples. Our findings indicate an increase of wall superheat on all samples, caused by added thermal resistance in the salt solution and by diminished nucleation activity in water. The latter resulted from spatially non-uniform and interconnected mechanisms of wettability transition towards hydrophilicity, surface chemistry changes and topography deformation. These mechanisms also appeared in salt solutions, where their relative importance compared to dominant influence of scaling was linked to crystallization-mitigative ability of the interface. In both liquids, laser-textured surfaces exhibited up to an order of magnitude lower degradation rates. Our results also emphasize the importance of evaluation times of several days to accurately gauge boiling-induced changes to the surface and the ambiguity of evaluating the latter through boiling curve stability.

• Language: English
• Keywords: pool boiling, heat transfer, surface aging, crystallization fouling, surface engineering, laser-texturing
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 17 str.
• Numbering: Vol. 242, [article no.] 122540
• PID: 20.500.12556/RUL-154183
• UDC: 66.02:544:537.24
• ISSN on article: 1359-4311
• DOI: 10.1016/j.applthermaleng.2024.122540
• COBISS.SI-ID: 182964995
• Publication date in RUL: 30.01.2024

Record is a part of a journal

• Title: Applied thermal engineering
• Shortened title: Appl. therm. eng.
• Publisher: Elsevier
• ISSN: 1359-4311
• COBISS.SI-ID: 1861910

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: vrenje v bazenu, prenos toplote, staranje površin, kristalizacijsko odlaganje, inženiring površin, lasersko teksturiranje