Spectral radiation model for simulation of heat transfer in glass melts
article
Radiation of heat in the near and mid-infrared wavelength range to the glass melt and into the molten glass is the main mechanism of heat transfer from the combustion space to the melting tank. Since glass is a semi-transparent medium in the mid infrared, an accurate description of the heat transfer in glass melts requires a spectrally resolved thermal radiation model. In this paper a newly developed spectral model, using the discrete ordinate method, and example modelling results will be presented. For this, the high temperature spectral properties of a green container glass melt were determined and used as input for the spectral band model. The calculated temperature distributions in the melt were compared to results obtained by a standard model, using the diffusion (Rosseland) approximation and to results obtained by a gray (wavelength independent) radiation model in the glass melt. It was found that the calculated temperatures obtained by the spectral model close to boundaries, especially at the melt surface, differ considerably from those obtained by the diffusion approximation. The agreement between available measured temperatures and the simulation results obtained using (spectral) radiation modelling in the melt was better than that between the measured temperatures and the simulation results obtained using the Rosseland approximation in the melt.
Topics
Fluid structure interactionGlass manufactureHeat exchangersHeating equipmentNanofluidicsPolynomial approximationRadiationSemiconductor dopingSurface diffusionThermoanalysisDiffusion approximation (DA)Discrete ordinate method (DOM)Glass meltingGreen container glassMelt surfacesMid infrared wavelength range (MWIR)Molten glassesRadiation modelingRosseland approximationsSimulation of heat transferSpectral bandingSpectral modelingSpectral propertiesSpectral radiation model
TNO Identifier
240730
ISSN
00171050
Source
Glass Technology, European Journal of Glass Science and Technology, Pt.A, 49(2), pp. 73-82.
Pages
73-82
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