Dynamic detachment of a gas bubble from a solid flat substrate performing normal harmonic vibrations |
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Authors: | V V Konovalov T P Lyubimova D V Lyubimov |
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Institution: | (1) Faculty Mw. Thermodynamic, Technical University Munich, 82748 Garching, Germany;(2) Directorate of Human Spaceflight, Head of ISS Utilisation Department, ESA-ESTEC, 2200 AG Noordwijk, The Netherlands |
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Abstract: | This paper presents an investigation of the detachment of a bubble from a solid flat substrate according to a dynamic scenario,
i. e., due to strong vibrations of the surface shape of the bubble caused by normal nonacoustic harmonic vibrations of the
substrate. The Layzer’s model based on an analysis of single-mode solutions near the bubble top was used to study its detachment
in microgravity, where the dynamics of the bubble surface is due to competition between liquid inertia forces and surface
tension forces. Detachment of the bubble from the substrate was determined from the condition of its elongation during vibrations
by a magnitude comparable to the radius of the bubble in equilibrium. The dependence of the vibration intensity required for
the detachment of the bubble on the problem parameters was determined using a number of empirical assumptions. The volume
of the detached bubbles was estimated. |
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