20.500.12556/RUL-116531 Laser-engineered microcavity surfaces with a nanoscale superhydrophobic coating for extreme boiling performance 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. 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 true false true Angleški jezik Slovenski jezik Neznano 2020-05-27 12:57:46 2020-05-27 12:57:52 2023-11-29 09:18:06 0000-00-00 00:00:00 2020 0 0 24419-24431 iss. 21 Vol. 12 May 2020 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.24(045) 1944-8244 10.1021/acsami.0c01594 14158851 RAZ_Moze_Matic_2020.pdf RAZ_Moze_Matic_2020.pdf 1 48AC5406CB2147F677954116512F318A 0c0ef66692225f9af82494fffdbc86b62242fdc46331bf65d1cba19b0aec373e f7071ebc-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=130155 https://pubs.acs.org/doi/10.1021/acsami.0c01594 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=130153 Fakulteta za strojništvo 0 0 0