Thermal radiation properties were investigated by a spectroscopic experiment on three molten alkali metal carbonates: lithium carbonate, sodium carbonate, and potassium carbonate. Reflectance spectra of the salt layers were measured at wave-lengths from 0.5 to 13.0 μm. The results were analyzed to obtain the spectra of the refractive index n and absorption coefficient K. Since the semi-transparent wave-length region of the salts was found to range in the main part of the Planckian distribution, the values of K were determined most carefully. The spectra of n and K are described by continuous functions of radiation wavelength for heat-transfer engineering application. Some common features of the radiation properties are reviewed over the molten nitrates, chlorides, and carbonates of the three alkali metals, lithium, sodium, and potassium.
|Number of pages
|Heat Transfer - Japanese Research
|Published - 1992
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes