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Pattern geometry optimization on superbiphilic aluminum surfaces for enhanced pool boiling heat transfer
Može, Matic (Author), Zupančič, Matevž (Author), Golobič, Iztok (Author)

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Abstract
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.

Language:English
Keywords:heat transfer, pool boiling, nucleate boiling, biphilic surfaces, surface engineering
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Number of pages:f. 1-13
Numbering:Vol. 161
UDC:536.24(045)
ISSN on article:0017-9310
DOI:10.1016/j.ijheatmasstransfer.2020.120265 Link is opened in a new window
COBISS.SI-ID:25544963 Link is opened in a new window
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Downloads:287
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Record is a part of a journal

Title:International journal of heat and mass transfer
Shortened title:Int. j. heat mass transfer
Publisher:Pergamon Press
ISSN:0017-9310
COBISS.SI-ID:3064335 This link opens in a new window

Document is financed by a project

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.:J2-1741
Name:Lasersko mikro in nanostrukturiranje za razvoj biomimetičnih kovinskih površin z edinstvenimi lastnostmi (LaMiNaS)

Secondary language

Language:Slovenian
Keywords:prenos toplote, vrenje v bazenu, mehurčkasto vrenje, bifilne površine, inženiring površin

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