Glass remains to be a fabric of serious medical and technological curiosity; notwithstanding, the industrial pressures at the glass undefined, the emphasis on international markets, and the global awareness to power and environmental conservation proceed to extend. Forty-seven papers provide new recommendations to the demanding situations of glass production, fairly as they pertain to melting and forming.Content:
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Extra info for Advances in Fusion and Processing of Glass III, Volume 141
On the studies of helium-supported fining processes. G. Philips Displays, is also gratefully acklowledged for its contribution to this paper. NOMENCLATURE Cgi = concentration of dissolved gas i in melt (mole/m3) Cü= concentration of gas i in the melt in equilibrium with the vapor pressure of gas i in the bubble (mole/m3) = Li 'Pbi, CSi = concentration of the gas i in the glass melt (mole/m3) Di = diffusion coefficient of gas i in the molten glass (m2/s) Dc,i = coefficient determining concentration profile of reactive gases in the melt  (m2/s) c = factor with a value between 2/9 and 1/3.
The fining gases dilute the water vapor in the bubble and vice versa. This will support the diffusion rates of the other gases as well, since the dilution processes keep the concentrations of the gases in the bubble (and the Cu values in equation 11) relatively low, and this will increase the driving force for diffusion of all gases into the bubbles. An increase in the water concentration in the melt will lower also the fining onset temperature. The water in the melt gives a contribution to the vapor pressure in the bubble, and the pSC>2 plus ρθ2 partial pressures together need not exceed 1 bar to onset the fining in a water-rich melt.
Ceram. Soc, 69 (1987) nr. 2, pp. C. Beerkens: "Chemical equilibrium reactions as driving forces for growth of gas bubbles during fining," 2nd International Conference on Fusion and Processing of Glass, Düsseldorf (1990). Glastech. Ber. Sonderband 63K (1990), pp. 222-242 12 F. Krämer: "Mathematisches Modell der Veränderung von Glasblasen in Glasschmelzen," Glastech. , 52 (1979) nr. 2, pp. 43-50 13 L. Némec: "The behaviour of bubbles in glass melts. Part 2. , 21 (1980) nr. 3. pp. 139-144 14 M. Mühlbauer and L.
Advances in Fusion and Processing of Glass III, Volume 141