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Title
Japanese:大体積の平面上液滴の形状情報から液体の表面張力を決定する 手法の提案とその適用性の検討 
English:Proposal and applicability of a method to evaluate surface tension of liquid using large volume sessile drop in gravity 
Author
Japanese: 高橋邦夫, 井口洋二, 濱田恵一朗, ヘムタビーパソムポーン, 齊藤滋規.  
English: TAKAHASHI Kunio, IGUCHI Yoji, HAMADA Keiichiro, HEMTHAVY Pasomphone, SAITO Shigeki.  
Language Japanese 
Journal/Book name
Japanese:溶接学会論文集 
English:quarterly journal of the Japan Welding Society 
Volume, Number, Page vol. 38    no. 3    pp. 193-198
Published date Oct. 12, 2020 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
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Conference site
Japanese: 
English: 
DOI https://doi.org/10.2207/qjjws.38.193
Abstract Based on a theory of sessile drop in gravity, a method to evaluate surface tension is proposed, and its applicability is discussed. All of parameters are theoretically normalized. Although it is impossible to obtain analytic solution of the surface profile of the sessile drop, it is possible in an extreme condition of large volume. A universal parameter which determine the volume of liquid is derived in a normalized form. The large volume condition is theoretically defined using the parameter. Under the large volume approximation, an equation is derived which gives the surface tension from a height and an angle of the drop surface. In order to discuss applicability of the approximation, numerical calculation is carried out. It is found that the surface tension can be obtained with a tolerance less than 16%, if we measure the height of the sessile drop and the contact angle, under the large volume approximation. This method proposed in the present study is beneficial for the estimation of wettability of liquid using sessile drop.

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