20.500.12556/RUL-118090 Pattern geometry optimization on superbiphilic aluminum surfaces for enhanced pool boiling heat transfer In this study, the optimal surface pattern of low and high wettability regions for enhanced boiling heat transfer is investigated using aluminum superbiphilic surfaces. Samples are fabricated by combining chemical vapor deposition of a fluorinated silane to turn them superhydrophobic and nanosecond laser texturing to render selected areas superhydrophilic. Triangular lattice pattern of superhydrophobic circular spots is utilized with spot diameters between 0.25 mm and 1.0 mm and pitch values of 0.5-2.5 mm. Pool boiling heat transfer performance of superbiphilic surfaces is evaluated using saturated water at atmospheric pressure. A strong wettability contrast is shown to be important in ensuring high heat transfer performance of wettability-patterned surfaces. Highest heat transfer performance is achieved using 0.5 mm diameter spots with a spot pitch of 1 mm and a corresponding superhydrophobic area fraction of approx. 23%. The optimal pitch value will provide a high density of potentially active nucleation sites but still allow for the development of the thermal boundary layer thus not inhibiting the activation of neighboring spots. The size of (super)hydrophobic spots appears not to have a major influence on the boiling performance when using the optimal spot pitch. The developed superbiphilic surfaces increase the CHF and provide greatly enhanced heat transfer coefficients especially at medium and high heat fluxes, making them suitable especially for high-heat-flux applications. heat transfer pool boiling nucleate boiling biphilic surfaces surface engineering critical heat flux surface functionalization heat transfer enhancement prenos toplote vrenje v bazenu mehurčkasto vrenje bifilne površine inženiring površin kritični toplotni tok funkcionalizacija površin izboljšanje prenosa toplote true false true Angleški jezik Slovenski jezik Članek v reviji 2020-08-19 09:59:27 2020-08-19 09:59:33 2023-11-29 09:01:25 0000-00-00 00:00:00 2020 0 0 13 str. art. 120265 Vol. 161 Nov. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.24(045) 0017-9310 10.1016/j.ijheatmasstransfer.2020.120265 25544963 3064335 RAZ_Moze_Matic_2020.pdf RAZ_Moze_Matic_2020.pdf 1 1F9051772D23F44861F4E36A738917D0 b828eff5b95921baa78c278deb574378d238661e371598ad87408c765bd9a961 c1a9d0f6-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=141456 https://www.sciencedirect.com/science/article/pii/S0017931020332014 0 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132070 Fakulteta za strojništvo 0 0 0