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Contact-line behavior in boiling on a heterogeneous surface: Physical insights from diffuse-interface modeling
Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Motooka 744, Fukuoka 8193905, Japan.;Univ Tsukuba, Grad Sch Syst & Informat, Dept Engn Mech & Energy, Tennodai 1-1-1, Tsukuba, Ibaraki 3058573, Japan..
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Physicochemical Fluid Mechanics.
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Physicochemical Fluid Mechanics.ORCID iD: 0000-0003-3336-1462
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Physicochemical Fluid Mechanics.ORCID iD: 0000-0003-2830-0454,
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2020 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 5, no 3, article id 033603Article in journal (Refereed) Published
Abstract [en]

Enhancement of boiling heat transfer on biphilic (mixed-wettability) surfaces faces a sudden reversal at low pressures, which is brought about by excessive contact-line spreading across the wetting heterogeneities. We employ the diffuse-interface approach to numerically study bubble expansion on a heating surface that consists of opposing wettabilities. The results show a dramatic shift in the dynamics of a traversing contact line across the wettability divide under different gravities, which correspond to variable bubble growth rates. Specifically, it is found that the contact-line propagation tends to follow closely the rapidly expanding bubble at low gravity, with only a brief interruption at the border between the hydrophobic and hydrophilic sections of the surface. Only when the bubble growth becomes sufficiently weakened at high gravity does the contact line get slowed down drastically to the point of being nearly immobilized at the edge of the hydrophilic surface. The following bubble expansion, which faces strong limitations in the direction parallel to the surface, features a consistent apparent contact angle at around 66.4 degrees, regardless of the wettability combination. A simple theoretical model based on the force-balance analysis is proposed to describe the physical mechanism behind such a dramatic transition in the contact-line behavior.

Place, publisher, year, edition, pages
American Physical Society, 2020. Vol. 5, no 3, article id 033603
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-271539DOI: 10.1103/PhysRevFluids.5.033603ISI: 000518538200001Scopus ID: 2-s2.0-85082672633OAI: oai:DiVA.org:kth-271539DiVA, id: diva2:1426568
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QC 20200427

Available from: 2020-04-27 Created: 2020-04-27 Last updated: 2020-04-27Bibliographically approved

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