A NEW TECHNIQUE TO SEPARATELY EVALUATE THE FFECTS OF SURACE TENSION AND VISCOSITY ON RUPTURE OF A BUBBLE AT WATER SURFACE

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  • NABESAKA Seishi
    社団法人 土木学会 水資源開発公団 草木ダム管理所
  • ETON T. Goji
    社団法人 土木学会 近畿大学 理工学部 社会環境工学科
  • TAKEHARA Kohsei
    社団法人 土木学会 近畿大学 理工学部 社会環境工学科

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  • 水表面の気泡の破裂現象に対する表面張力と粘性の影響の個別評価の試み
  • ミズ ヒョウメン ノ キホウ ノ ハレツ ゲンショウ ニ タイスル ヒョウメン チョウリョク ト ネンセイ ノ エイキョウ ノ コベツ ヒョウカ ノ ココロミ

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Abstract

The rupture of single bubble at water surface was visualized by using a high-speed video camera. Surface tension and viscosity of water are changed by adding ethanol which dissolves into water. A technique is proposed in order to separately evaluate effects of viscosity and surface tension on the droplets generation from bubble eruptions by utilizing the peculiar characteristics of the solution. In the observation of a bursting bubble at water surface, two kinds of bubbles, of which diameters are 2mm and 20mm respectively, are tested. Observation results support the following conclusion; (1) surface tension changes the size and speed of the jet drops of a 2mm bubble bursting, (2) viscosity affects the generation of jet drops of a 2mm bubble bursting, (3) the size, speed and direction of film drops generated from a 20mm bubble are changed by surface tension or viscosity.

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