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Tolstov, V. A.; Kiselev, V. N.; Denisova, S. S.; Kas'yanova, A. V.; Fomin, K. A.

doi:10.1023/a:1007158516539

Cited by 4 publications

(2 citation statements)

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“…Computational model must be validated by comparison with experimental measurements. 7) Although the use of physical modeling in the glass industry had evolved slowly over several decades, comparatively few studies had been conducted on physical modeling compared to computer modeling. Therefore, the purpose of this study is provided not only insight information on the effects of furnace design and operation condition on glass cleanliness but essential data for the validation of the numerical models.…”

Section: Introductionmentioning

confidence: 99%

Effects of Process Conditions of Melting Furnace on Alkali-Free Glass Cleanliness

Yen

Hwang

2009

Mater. Trans.

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In this study, the effects of process conditions such as air bubbling, top radiation heating and electrode heating in a melting furnace on the cleanliness of alkali-free glass, which is characterized by the residence time and trajectories of tracer particles, is investigated by a reduced physical model. The reduced physical model was made of an acrylic tank, which is similar in shape of the actual glass melting furnace but one tenth in size, with heating electrodes, top radiation heating and air bubbling devices. Silicon oil was used to simulate molten glass. The gas flow rate was set at 6:67 Â 10 À7 Nm 3 /s. The electrode and radiation temperatures were set at 298 K, 323 K, 353 K and 373 K. Residence time, which is the time required for tracer particles to flow from inlet to outlet, was measured to evaluate the cleanliness of the molten glass. The results showed that the effect of bubbling on residence time is larger than that of top radiation heating which is then larger than that of electrode heating when one single process variable is considered. For the effect of the coupling of two process variables, the dual effect of bubbling and radiation is better than that of bubbling and electrode which is in turn better than that of radiation and electrode. As all three devices were all turned on, it was found that the most desirable condition to obtain clean glass is bubbling with electrode temperature of 323 K and radiation temperature of 373 K.

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Section: Introductionmentioning

confidence: 99%

Effects of Process Conditions of Melting Furnace on Alkali-Free Glass Cleanliness

Yen

Hwang

2009

Mater. Trans.

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“…Murnane et al also commented that although the use of physical model within the glass industry had evolved slowly over several decades, comparatively only few studies had been conducted on physical modeling corresponding to computer modeling. Tolstov et al 2) established a physical model based on similarity theory to investigate the glass melt hydrodynamics in a highly efficient melting furnace for container glass. The design has to ensure not only the similarity of the thermal and hydrodynamic processes in the functioning furnace but also convenience in observation and the ability to measure the glass melt routes as well as velocity and temperature fields.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Fluid Flow Behaviors in an Alkali-Free Glass Melting Furnace

Yen

Hwang

2008

Mater. Trans.

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In this study, fluid flow behavior of molten glass in a melting furnace, which is characterized by the stirring range of gas bubbles and trajectories of tracer particles, is investigated by a reduced physical model and a mathematical model. The reduced physical model was made of an acrylic tank, which was similar in shape of the actual glass melting furnace but one fifth in size, with heating electrodes and air bubbling devices. The gas flow rates were set at 8.27, 10.42 and 14.75 Ncm 3 /sec based on similarity conversions. The electrode temperatures were set at 25 C and 150 C. The mathematical model was based on the SOLA-VOF technique, which incorporated a Quasi-single Phase method to accommodate the gas bubbling phenomena. Results from the physical model showed that the trajectories of tracer particles and minimum residence time (MRT) increase with gas flow rates. This is caused by the increase in stirring range of gas bubbles, which was demonstrated by the physical model as well as the mathematical model. The trajectories of tracer particles at the electrode temperature of 150 C were observed to be longer than those for the electrode temperature of 25C from the physical model. This is due to the free convection induced by the heating electrodes, which is also shown by the mathematical model.

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