Bubble Formation on Porous Media Surfaces
In metal casting gas purging is used for impurity reduction. The impurities concentrate on the surface of the gas bubbles and are transported towards the slag by the ascending bubbles. Therefore, efficient flotation requires an optimal bubble volume, i.e. an optimal surface size.
In this context it is known that the bubble formation is strongly influenced by the non-wettability between the porous refractory and the melt. In our experiments we investigated the air bubble formation on aluminium and teflon surfaces in water. We studied the influence of non-wettability, surface inclination and surface roughness on the bubble shape and the bubble volume.
KeywordsInclination Angle Contact Line Bubble Formation Capillary Length Bubble Volume
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