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Stability of glass foams : experiments at the bubble scale and on vertical film

Abstract : For investigating glass foams stability, experiments with a single bubble rising towards the free surface of molten glass and with vertical films are performed for several values of glass chemical composition, viscosity, bubble size and gas nature. The glass lamella on top of the bubble is observed by video-recording and its thickness evolution is measured by optical interferometry. The lamella thins as a result of buoyancy and capillary forces and then it ruptures. Actually the lamella thinning occurs in two steps. In the first step, the drainage is regular and the thinning rate depends on Bond number. In the second step a backward flow is observed above 1200°C for ordinary soda-lime-silica glass, which is explained as Marangoni counter flow due to evaporation of volatile species such as sodium. As the lamella ruptures tiny bubbles are created by the rupture of bubble lamella on the free surface for large bubbles and low viscosity of the melt
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Helena Kočárková. Stability of glass foams : experiments at the bubble scale and on vertical film. Other [cond-mat.other]. Université Paris-Est, 2011. English. ⟨NNT : 2011PEST1092⟩. ⟨tel-00664444⟩

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