One-dimensional temperature profiles and heat fluxes within a slab of molten glass were measured experimentally. The glass slab was contained between two parallel platinum-lined ceramic plates. The plate temperatures were kept above 2000 deg F so that radiation heat flux was always equal to or larger than conduction. An optical method of temperature measurement was developed in which a helium–neon laser beam was directed along an isothermal path through the glass. The attenuation of the beam was a strong function of temperature and was used to evaluate the local temperatures within the glass slab. In order to perform a theoretical analysis the spectral absorption coefficient of the glass was measured from 2000 to 2300 deg F. Two analyses were performed: one for a diffuse platinum–glass boundary and the other for a specular boundary. The calculated temperatures agree with the measured values within 5 deg F throughout the slab, and the measured and predicted heat fluxes agree within 10 percent.
An Experimental and Analytical Study of Radiative and Conductive Heat Transfer in Molten Glass
Eryou, N. D., and Glicksman, L. R. (May 1, 1972). "An Experimental and Analytical Study of Radiative and Conductive Heat Transfer in Molten Glass." ASME. J. Heat Transfer. May 1972; 94(2): 224–230. https://doi.org/10.1115/1.3449904
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