Study on wetting phenomena between solid and liquid on the basis of tribological concept

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03860
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Kumamoto University
• Principal Investigator: Yonemoto Yukihiro 熊本大学, 大学院先端科学研究部(工), 准教授 (70516418)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 濡れ性 / 表面粗さ / 液滴 / 動的濡れ性

Outline of Final Research Achievements

In this research, the development of dynamic wetting phenomena was tried on the basis of tribological concept aiming for the understanding the wettability without geometrical approach. Droplet wetting behavior between parallel plated was experimentally observed. In the experiment, force exerted on the droplet was measured using force gauge sensor. The theoretical consideration was also performed on the basis of the experimental results. It was found that the Laplace pressure and the surface tension at the contact line were important factor to understand the wetting behavior. Especially, it was revealed that the contact line remained stationary condition until the force reached a certain value, which was similar to the behavior where the friction exists. From the present research, it was found that not only the conventional geometrical concept but also new concept was needed for further understanding the wetting behavior.

Free Research Field

混相流

Academic Significance and Societal Importance of the Research Achievements

固体面上液体の濡れ挙動は主に接触角により特徴づけられ、特に接触線の運動を伴うような動的濡れ性では、接触線の移動速度と接触角を関係づけた経験的な式を用いることが多いため、その用途も限定的となる。本研究から、接触線と固体面上の相互作用には摩擦現象で見られるような挙動の重要性が明らかとなった。接触線の移動速度を摩擦の概念を取り入れた力学的な観点から決定することで、動的濡れ挙動の理解のための新たな解釈が可能となるため、学術的に意義深いものと考えられる。また、得られた知見を、表面が粗い物体などに発展させることで、工業的な用途も広がるものと考えられる。