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  • 1.
    Shen, Biao
    et al.
    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..
    Liu, Jiewei
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Physicochemical Fluid Mechanics.
    Amberg, Gustav
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Physicochemical Fluid Mechanics.
    Do-Quang, Minh
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Physicochemical Fluid Mechanics.
    Shiomi, Junichiro
    Univ Tokyo, Dept Mech Engn, Hongo 7-3-1, Tokyo 1138656, Japan..
    Takahashi, Koji
    Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Motooka 744, Fukuoka 8193905, Japan.;Kyushu Univ, Dept Aeronaut & Astronaut, Motooka 744, Fukuoka 8193905, Japan..
    Takata, Yasuyuki
    Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Motooka 744, Fukuoka 8193905, Japan.;Kyushu Univ, Dept Mech Engn, Motooka 744, Fukuoka 8193905, Japan..
    Contact-line behavior in boiling on a heterogeneous surface: Physical insights from diffuse-interface modeling2020In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 5, no 3, article id 033603Article in journal (Refereed)
    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.

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