Thermal radiation properties were investigated by a spectral experiment on three kinds of molten alkali metal nitrates: lithium nitrate, sodium nitrate, and potassium nitrate. A new experimental technique was developed for highly corrosive liquids at high temperatures. Reflectance spectra of the salt layers were measured in the wavelength region from 0.4 to 13.0 μm. In the intermediate region between the transparent region in the visible through the near-infrared and Reststrahlen region in the far-infrared, the radiation properties were found not to be described by extrapolation of the dispersion relations in the adjacent two regions. The measured reflectance results were analyzed to describe the spectra of the refractive index and absorption coefficient by continuous functions of radiation wavelength for heat-transfer engineering applications.
|Number of pages||11|
|Journal||Heat Transfer - Japanese Research|
|Publication status||Published - 1991|
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes