Glass remains to be a cloth of significant medical and technological curiosity; although, the industrial pressures at the glass undefined, the emphasis on worldwide markets, and the global recognition to strength and environmental conservation proceed to extend. Forty-seven papers supply new ideas to the demanding situations of glass production, rather 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
655-661 58 L. Nemec: "Diffusion-controlled dissolving water vapor bubbles in molten glass," Glass Technol. 10 (1969), pp. 176-181 Table I. 05 20K/min 1575 K 0 or 10 ml/min 1700 K lK/min 20K/min 2K/min Bubbling during 60 minutes Fining during 75 minutes secondary fining Table II. 36 % C0 2 in bubble 40-90 95 35-50 * >50% helium ** very low pressure Not analyzed Advances in Fusion and Processing of Glass III Advances in Fusion and Processing ofGlass ΙΠ Edited by James R. Vamer, Thomas P. Seward ΙΠ and Helmut A.
Ber. 31 (1958), 221-228. E. Schwiete and G. Ziegler, Glastech. Ber. 28 (1955), 137-146. 6 J. E. Sharp, J. Am. Ceram. Soc. 41 (1958), 461-463. D. l. Primenko, Soc. J. Glass Phys. Chem. 11 (1985), 206-211. 8 C. Madivate, F. Müller and W. Wilsmann, Glastech. Ber. 69 (1996), 167178. 9 R. Conradt, Glastech. Ber. 63K (1990), 134-143. 10 R. Conradt, Z. Metallkunde 92 (2001), 1158-1162. n M . Lindig, in: HVG-Fortbildungskurs: „Wärmetransportprozesse bei der Herstellung und Formgebung von Glas", The German Society of Glass Technology, Offenbach 2002.
Finally, the offgas temperature T0ff is derived from the adiabatic combustion temperature T^ and the temperature Tex at which the melt is extracted from the basin. In the glass melting process, both temperature levels Tad and Tex are fixed while the offgas temperature is a result of heat loss to the basin and heat loss through the crown. The related heat transfer is given in terms of so-called numbers of transfer units  NTUht and NTUwo, respectively. In general terms, NTU denotes the dimensionless ratio of a heat transfer rate per K temperature difference across a boundary and the heat capacity of a mass flow passing this boundary, thereby delivering or receiving heat.
Advances in Fusion and Processing of Glass III, Volume 141