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Contact-line behavior in boiling on a heterogeneous surface: Physical insights from diffuse-interface modeling
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Motooka 744, Fukuoka, Japan; Department of Engineering Mechanics and Energy, Graduate School of Systems and Information, The University of Tsukuba, Tennodai 1-1-1, Tsukuba, Japan.ORCID iD: 0000-0002-5027-6158
Department of Mechanics, The Royal Institute of Technology, Stockholm, Sweden.
Department of Mechanics, The Royal Institute of Technology, Stockholm, Sweden.ORCID iD: 0000-0003-3336-1462
Department of Mechanics, The Royal Institute of Technology, Stockholm, Sweden.
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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
2020. Vol. 5, no 3, article id 033603
Keywords [en]
Fluid Flow and Transfer Processes, Modelling and Simulation, Computational Mechanics
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:sh:diva-47796DOI: 10.1103/physrevfluids.5.033603ISI: 000518538200001OAI: oai:DiVA.org:sh-47796DiVA, id: diva2:1619307
Available from: 2021-12-13 Created: 2021-12-13 Last updated: 2021-12-13Bibliographically approved

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Amberg, Gustav

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