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Laser-engineered microcavity surfaces with a nanoscale superhydrophobic coating for extreme boiling performanceMože, Matic ...Functionalized interfaces enhancing phase-change processes have immense applicability in thermal management. Here, a methodology for fabrication of surfaces enabling extreme boiling heat transfer ... performance is demonstrated combining direct nanosecond laser texturing and chemical vapor deposition of a hydrophobic fluorinated silane. Multiple strategies of laser texturing are explored on aluminum with subsequent nanoscale hydrophobization. Both superhydrophilic and superhydrophobic surfaces with laser-engineered microcavities exhibit significant enhancement of the pool boiling heat transfer. Surfaces with superhydrophobic microcavities allow for enhancements of the heat transfer coefficient of over 500%. Larger microcavities with a mean diameter of 4.2 um, achieved using equidistant laser scanning separation, induce an early transition into the favorable nucleate boiling regime, while smaller microcavities with a mean diameter of 2.8 um, achieved using variable separation, provide superior performance at high heat fluxes. The enhanced boiling performance confirms that the Wenzel wetting regime is possible during boiling on apparently superhydrophobic surfaces. A notable critical heat flux enhancement is demonstrated on superhydrophobic surfaces with engineered microstructure showing definitively the importance and concomitant effect of both the surface wettability and topography for enhanced boiling. The fast, low-cost and repeatable fabrication process has great potential for advanced thermal management applications.Source: ACS applied materials & interfaces. - ISSN 1944-8244 (Vol. 12, iss. 21, May 2020, str. 24419-24431)Type of material - article, component part ; adult, seriousPublish date - 2020Language - englishCOBISS.SI-ID - 14158851
Author
Može, Matic |
Senegačnik, Matej |
Gregorčič, Peter, fizik |
Hočevar, Matej, 1982- |
Zupančič, Matevž, 1990- |
Golobič, Iztok
Topics
surface functionalization |
laser surface engineering |
hydrophobic surfaces |
pool boiling |
nucleate boiling |
laser structuring |
funkcionalizacija površin |
laserski inženiring površin |
hidrofobne površine |
vrenje v bazenu |
mehurčkasto vrenje |
lasersko strukturiranje
source: ACS applied materials & interfaces. - ISSN 1944-8244 (Vol. 12, iss. 21, May 2020, str. 24419-24431)
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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 |
Senegačnik, Matej | 52342 |
Gregorčič, Peter, fizik | 29224 |
Hočevar, Matej, 1982- | 32545 |
Zupančič, Matevž, 1990- | 36685 |
Golobič, Iztok | 05566 |
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