Radiative transfer between surfaces with spectral, directional, and temperature dependent properties
Abstract
Real surface property effects on local and overall heat transfer were studied for a simple system of interacting opaque surfaces irradiated by a collimated solar flux. Tungsten is employed as a representative metal and Roberts model is used to describe the wavelength and temperature dependence of its optical parameters. Relationships of electromagnetic theory are employed to describe directional dependence of spectral properties. Local and overall radiant heat flux results for surfaces with wavelength, temperature and direction dependent properties indicate that heat transfer is more dependent on wavelength than either temperature or direction. Dimensionless local absorbed solar irradiation for surfaces irradiated by a collimated solar flux is found to be a weak function of temperature and to be more strongly dependent on wavelength and temperature.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1974
- Bibcode:
- 1974PhDT........26F
- Keywords:
-
- Collimators;
- Radiative Heat Transfer;
- Solar Flux;
- Surface Temperature;
- Tungsten;
- Absorption Spectra;
- Optical Properties;
- Reflected Waves;
- Fluid Mechanics and Heat Transfer