Matic Može (Avtor), Matej Senegačnik (Avtor), Peter Gregorčič (Avtor), Matej Hočevar (Avtor), Matevž Zupančič (Avtor), Iztok Golobič (Avtor)

Povzetek

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.

Ključne besede

surface functionalization;laser surface engineering;hydrophobic surfaces;pool boiling;nucleate boiling;laser structuring;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FS - Fakulteta za strojništvo
UDK: 536.24(045)
COBISS: 14158851 Povezava se bo odprla v novem oknu
ISSN: 1944-8244
Št. ogledov: 1582
Št. prenosov: 842
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: funkcionalizacija površin;laserski inženiring površin;hidrofobne površine;vrenje v bazenu;mehurčkasto vrenje;lasersko strukturiranje;
Strani: str. 24419-24431
Letnik: ǂVol. ǂ12
Zvezek: ǂiss. ǂ21
Čas izdaje: May 2020
DOI: 10.1021/acsami.0c01594
ID: 11752595