| 摘要 |
PROBLEM TO BE SOLVED: To improve the heat transfer coefficient by forming the surface of condensation transfer surface in contact with the condensate element in the super-dropwise condensed condition in which no drops generated from the condensate element are adhered to easily separate the condensate from the condensation surface. SOLUTION: A paint layer 24 consisting of the powder particles (0.015-20μm) 22 of low surface tension and the binder 23 to fix the particles is formed on the surface of a base material 21 of a condensation surface of a condensation pipe. Fine rugged parts 25 are formed on the whole paint layer by projecting powder particles 22. The material of the particles 22 is silica, etc., and silicone oil, etc., is coated on the surface as the treatment agent for low surface tension. The formed condensation surface forms the super-dropwise condensed condition with a thin air film between the condensate element and the fine rugged parts, and the generated condensate is spheroidized so as to be rapidly detached from the condensation surface. Thus, the continuous heat flow of the vapor latent heat is formed to the condensation surface to remarkably improve the heat transfer coefficient.
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