Measurement of the absorption coefficient of liquid alumina by the thermal wave technique
Aleksey Yu Vorobyev, Vadim A Petrov, Vsevolod E Titov, Aleksander P Chernyshev
High-temperature melt of alumina (Al2O3) has been studied by the thermal wave technique in the wavelength range 3 – 8 mm at temperatures from 2300 to 2800 K, where radiative heat transfer plays an important role in the formation of the temperature field in the sample and affects the thermal waves. A numerical model of combined radiative and conductive heat transfer in nonscattering media was applied to obtain the value of the absorption coefficient of molten alumina in an air-oxidising ambient atmosphere. Descriptions of the experimental setup and the numerical model are presented. Data on the absorption coefficient of molten alumina have been obtained in the wavelength range 3 – 8 mm at two temperatures: 2500 and 2700 K.