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Surface chemistry and morphology transition induced by critical heat flux incipience on laser-textured copper surfacesMože, Matic ...Stability of functionalized surfaces is an often-neglected topic in phase-change heat transfer research. Here, we examine the chemical and morphological changes of textured surfaces on the molecular ... and atomic level after the critical heat flux incipience during saturated pool-boiling of water. SEM imaging, EDS, AES and XPS analyses are used to examine the surface changes. Copper samples were laser textured via ablation using a nanosecond fiber laser under air or argon atmosphere. Multiscale microcavities, which serve as preferential nucleation sites, were produced on the samples, which exhibited significantly enhanced heat transfer performance in pool-boiling tests. Repeated formation of a vapor film and accompanying temperatures of up to 320°C during the tests resulted in changes of the surface chemistry and nanomorphology. It was determined that Cu (II) oxide and hydroxide transform into Cu (I) oxide and Cu metal as a result of repeated low-temperature annealing of the surface when a vapor film is formed during the transition towards film boiling. This additionally causes a wettability transition of the functionalized surfaces from hydrophilic towards hydrophobic. Both effects importantly influence the solid-liquid-vapor interface during phase-change heat transfer. Overall, surfaces functionalized via laser texturing exhibited significantly enhanced stability and boiling heat transfer performance.Source: Applied Surface Science. - ISSN 0169-4332 (Vol. 490, Oct. 2019, str. 220-230)Type of material - article, component part ; adult, seriousPublish date - 2019Language - englishCOBISS.SI-ID - 16653083
Author
Može, Matic |
Zupančič, Matevž, 1990- |
Hočevar, Matej, 1982- |
Golobič, Iztok |
Gregorčič, Peter, fizik
Topics
functionalized surfaces |
laser surface engineering |
laser texturing |
laser ablation |
heat transfer |
nucleate boiling |
funkcionalizirane površine |
laserski inženiring površin |
lasersko teksturiranje |
laserska ablacija |
prenos toplote |
mehurčkasto vrenje
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Može, Matic | 52341 |
Zupančič, Matevž, 1990- | 36685 |
Hočevar, Matej, 1982- | 32545 |
Golobič, Iztok | 05566 |
Gregorčič, Peter, fizik | 29224 |
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