Advances in Fusion and Processing of Glass III, Volume 141

Glass remains to be a cloth of serious medical and technological curiosity; in spite of the fact that, the industrial pressures at the glass undefined, the emphasis on international markets, and the global recognition to strength and environmental conservation proceed to extend. Forty-seven papers supply new strategies to the demanding situations of glass production, quite as they pertain to melting and forming.Content:

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Extra resources for Advances in Fusion and Processing of Glass III, Volume 141

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However, at the pressure minimum value, the low pressure acts on a larger (expanding) bubble, and the bubble is forced to the pressure minimum (at the nearest pressure antinode). This force to the pressure antinode is larger than the force of the smaller bubble at the pressure maximum towards the pressure node. Thus, the net result is an average movement of the small bubble in the direction of the pressure antinode. Larger bubbles, which cannot follow the frequency of the applied acoustic field, because of the low resonance frequency of large bubbles, are forced towards pressure nodes.

They read, in the quoted sequence, H s f =H i n +H r e Hfire H H ht = H =H (1) H H H H sf " off = ex + wo + wu H ex+ wu H off = stack + H (2) (3) H r c + wx H exch = Hoff - Hstack = Hre + Hwx (4) (5) As pointed out earlier [1, 2], the quantities Hi„, H0ff, Hre, and Hstack related to the hot stream can be calculated via combustion calculations (as explained in many textbooks) in a fully quantitative way. As a prerequisite, the composition of the fuel (yielding its net calorific value HNCV, oxygen demand, and offgas composition), the air (or oxygen) excess, and the temperature levels T0ff, Trc, and Tstack need to be known.

4, pp. H. Doremus: "Diffusion of oxygen from contracting bubbles in molten glass," J. Am. Ceram. Soc. 43 (1960), pp. 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.

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