Ceramics-Silikáty 29, (3) 193 - 202 (1985) |
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| FOR MATION OF CONV'ECTIVE FLOW IN GLASS MELTS DUE TO VAPORIZATION OF A SURFACE ACTIVE COMPONENT
PART I: Experimental method and results
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Němec Lubomír 1, Bařtipán Ivo 2
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1 Joint Laboratory for the Chemistry and Technology of Silicates and Czechoslovak Academy of Sciences and Institute of Chemical Technology, Suchbátarova 5, 166 28 Prague 6, CZ
2 Sklo Union, Concern Corporation, Sklotas, Dukla Oloví Works, CZ
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In the vaporization of fluorides from opal glass melts and in that of boron oxide from Neutral glass there occurs the so-called cell flow which is caused by surface forces. Application of the high-temperature motion-picture technique permitted the shape and the rate of this flow to be determined at 1250-1350 °C in the atmosphere of flowing dry and moist nitrogen. The rates of flow determined were of an order of 10⁻5 to 10-4 m s-1 and their courses in terms of time were in qualitative agreement with the volatilization losses of fluorides from the glass melt. |
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