Author: Cable M. Fernandes M. H. V.
Publisher: Society of Glass Technology
ISSN: 0031-9090
Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.39, Iss.4, 1998-08, pp. : 228-235
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Abstract
Standard models for describing convective mass transport are reviewed. Experiments on the volatilisation of sodium metaborate with varying flow rates of nitrogen over the melt are then reported. It is shown that, in these conditions, sodium metaborate volatilises without change in the composition of the melt but that the rate of volatilisation is considerably affected by the shielding effect of the rim of the capsule containing the sample. The influence of this shielding wall on the hydrodynamic conditions immediately above the surface of the sample is discussed. When this effect is taken into consideration the rate of evaporation is found to be independent of time as expected for congruent evaporation. It is suggested that transport in the gas phase controls the process of volatilisation according to simple laws of convective mass transfer.
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