Glass homogenization in electric furnaces

Fekolin, V. N.; Kolesov, Vitaliy; Shlychkov, L. N.

doi:10.1007/bf00696675

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“…Mechanical stirring is usually employed to avoid such inhomogeneities in the glass melt. 2 Mixing in nonturbulent flows can be greatly enhanced by chaotic advection, which is an intermediate regime between laminar and turbulent advection. 3 In two-dimensional unsteady flows and three-dimensional flows, fluid-particle trajectories can diverge exponentially and advection of individual particles in the fluid can become chaotic.…”

Section: Introductionmentioning

confidence: 99%

Chaotic mixing in a Joule-heated glass melt

et al. 2010

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A numerical study of two-dimensional thermal convection of a highly viscous fluid driven by volumetric heating has been carried out to investigate the effect of time-dependent thermal forcing on the degree of mixing. The problem is relevant to electrically heated glass melting furnaces which are traditionally operated with time-independent heating. The numerical computations carried out are for two model fluids representing semitransparent and opaque melts, respectively. Lagrangian motion of passive tracers is numerically simulated and degree of mixing in the glass melt is quantified in terms of mixing entropy. The computed flow patterns indicate that time-dependent streamlines intersect transversely and, thereby, result in well-mixed regions. The stirring mechanism involves the rotational stretching and folding produced by two oscillating vortices with varying size and circulation. The model predictions indicate that the chaotic mixing is strongly dependent on the period of electrode firing cycle. The present investigation demonstrates that time-dependent thermal forcing improves the mixing characteristics of both semitransparent and opaque glass melts significantly.

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Section: Introductionmentioning

confidence: 99%