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Heat Transfer Research

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ISSN Print: 1064-2285
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017015706
pages 1077-1088

WETTING BEHAVIOR OF WATER MICRODROPLETS IN NATURAL EVAPORATION

Yukihiro Yonemoto
Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
Tomoaki Kunugi
Department of Nuclear Engineering, Kyoto University, C3-d2S06, Kyoto Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan

ABSTRACT

The wetting phenomenon is related to improvements in the energy efficiency of many industrial devices and processes, including heat exchangers and nuclear power generation. However, despite the benefits of the application of the wetting phenomenon in many industrial devices, the theoretical description of the wetting phenomenon remains insufficient. Wettability is mainly related to an interaction between a liquid and a solid, and is characterized by a contact angle. When the volume of a droplet on a solid surface decreases due to a phase change such as evaporation, there are two stages in the droplet behavior. First, the contact angle decreases, with a constant contact area; this is known as contact angle hysteresis. Then, after reaching a certain contact angle, the contact line starts to recede with the size dependent on the contact angle. If a droplet is in a thermodynamic equilibrium state, this can oft en be explained using a modified Young equation in which the line tension is explicitly added. However, there are no adequate and convenient models to treat these phenomena in the nonequilibrium state. In the present study, the droplet behavior in natural evaporation was considered experimentally. Semiempirical models were proposed and compared with experimental data.