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Laser-engineered microcavity surfaces with a nanoscale superhydrophobic coating for extreme boiling performance
Može, Matic (Author), Senegačnik, Matej (Author), Gregorčič, Peter (Author), Hočevar, Matej (Author), Zupančič, Matevž (Author), Golobič, Iztok (Author)

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Abstract
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.

Language:English
Keywords:surface functionalization, laser surface engineering, hydrophobic surfaces, pool boiling, nucleate boiling, laser structuring
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Number of pages:24419-24431
Numbering:21, 12
UDC:536.24(045)
ISSN on article:1944-8244
DOI:10.1021/acsami.0c01594 Link is opened in a new window
COBISS.SI-ID:14158851 Link is opened in a new window
Views:197
Downloads:247
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Record is a part of a journal

Title:ACS applied materials & interfaces
Shortened title:ACS appl. mater. interfaces
Publisher:American Chemical Society
ISSN:1944-8244
COBISS.SI-ID:14731286 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:J2-1741
Name:Lasersko mikro in nanostrukturiranje za razvoj biomimetičnih kovinskih površin z edinstvenimi lastnostmi (LaMiNaS)

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0223
Name:Prenos toplote in snovi

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0392
Name:Optodinamika

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0132
Name:Fizika in kemija površin kovinskih materialov

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:Z2-9215
Name:Razvoj biomaterialov z laserskim teksturiranjem kovinskih zlitin (BiomatLasTex)

Secondary language

Language:Slovenian
Keywords:funkcionalizacija površin, laserski inženiring površin, hidrofobne površine, vrenje v bazenu, mehurčkasto vrenje, lasersko strukturiranje

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