ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 29, (3) 193 - 202 (1985)


FOR MATION OF CONV'ECTIVE FLOW IN GLASS MELTS DUE TO VAPORIZATION OF A SURFACE ACTIVE COMPONENT

PART I: Experimental method and results


 
Němec Lubomír 1, Bařtipán Ivo 2
 
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

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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