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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EVAPORATION AND BOILING IN THIN GAP

Dike Xu
Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan

Keita Ogawa
Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan

Mitsuhiro Matsumoto
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto, 606-8501, Japan ; Advanced Research Institute of Fluid Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto, 606-8530,

DOI: 10.1615/IHTC16.bae.022230
pages 859-864


KEY WORDS: Boiling and evaporation, Two-phase/Multiphase flow, Microfluidics

Abstract

A vapor washing treatment has been recently proposed for disposal of electric transformers, a main part of which is laminated metal plates immersed in insulating oils. To study its detailed mechanism, we have experimentally investigated transport and evaporation dynamics of liquid confined in a thin gap between solid plates under reduced pressure using a model system. As a test liquid, we use deionized water and ethanol. To visualize the liquid motion in the gap, we adopt sand-blasted glass plates with specified surface roughness. When a test liquid is sandwiched between the glass plates, incident LED light passes through the plates without much scattering; once the liquid starts to evaporate, dried surface of the plates scatters the light and we can monitor the flow pattern. Based on the transmitted light intensity, the whole plate area is categorized into three regions, i.e., completely wet, completely dried, and semi-dried one, from which the evaporation rate is successfully evaluated. Among many control parameters, the effect of surface roughness is mainly discussed in this paper. We show that an extended Lucas-Washburn model for liquid imbibition in porous media can explain the liquid transport dynamics in such a thin gap.

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