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Characterization of the Temperature Profile near Contact Lines of an Evaporating Sessile Drop

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  • Xiaodong Zhang

    (Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Yugang Zhao

    (Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    Key Laboratory of Icing and Anti/De-Icing, China Aerodynamics Research and Development Center, Mianyang 621000, China)

  • Dongmin Wang

    (Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

Abstract

Evaporation of a sessile drop is ubiquitous in nature and has many industrial applications. Despite extensive studies over recent decades, a critical issue, i.e., how temperature varies near contact lines, remains elusive. In this work, we report to date the first direct experimental measurement showing the microscopic temperature distribution near contact lines of an evaporating pinned sessile drop. Using a fluorescence-based thermometry, we find that the temperature at the free interface near contact lines varies drastically along the radial direction, engendering a concentric fringe pattern that evolves over the evaporation lifespan. The formation of such fringe patterns is attributed to a combined mechanism of locally enhanced evaporative cooling at the drop edge and the development of interfacial convective vortices due to Bénard-Marangoni instability. We also study the evaporation dynamics at different initial contact angles and find that the characteristics of this fringe pattern vary as the initial contact angle decreases. Our experimental investigation and theoretical analysis in this work reveal insights to the understanding of droplet evaporation dynamics in various heat transfer systems.

Suggested Citation

  • Xiaodong Zhang & Yugang Zhao & Dongmin Wang, 2023. "Characterization of the Temperature Profile near Contact Lines of an Evaporating Sessile Drop," Energies, MDPI, vol. 16(6), pages 1-12, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2623-:d:1093675
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    References listed on IDEAS

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    1. Robert D. Deegan & Olgica Bakajin & Todd F. Dupont & Greb Huber & Sidney R. Nagel & Thomas A. Witten, 1997. "Capillary flow as the cause of ring stains from dried liquid drops," Nature, Nature, vol. 389(6653), pages 827-829, October.
    2. Peter J. Yunker & Tim Still & Matthew A. Lohr & A. G. Yodh, 2011. "Suppression of the coffee-ring effect by shape-dependent capillary interactions," Nature, Nature, vol. 476(7360), pages 308-311, August.
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