Bubble removal from glass melts in a rotating cylinder
The use of centrifugal force may considerably accelerate bubble removal in glass melts (fining). The goal of this paper is to present results of the mathematical modelling of bubble behaviour in the centrifugal field. The choice of the appropriate calculation parameters is discussed and the model of behavior of multicomponent bubbles in the centrifugal field is presented. The effects of cylinder rotation velocity, bubble size, its initial composition and temperature on the bubble removal time have been studied. The results show that bubble removal under the effect of centrifugal force is a complicated process, affected by several mutually contradictory factors, and involving bubble removal both by complete dissolution and centrifugally. Bubble removal is easier for one-component bubbles that containing gas easily soluble in the melt. The principal problem for the removal of multicomponent bubbles (with compositions corresponding to bubbles from the industrial glass melting process) is small bubbles, completely or almost completely dissolved in the melt because the dissolution of multicomponent bubbles is a very slow process. The search for optimum conditions for centrifugal fining therefore needs to avoid any requirement for complete bubble dissolution and if possible, to get rid of small bubbles by melt pretreatment.
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Document Type: Research Article
Publication date: August 1, 2010