Radiation Flashcards
What factors affect radiation?
Temperature
Spectral dependance
Direction dependance
What is Emmisive power?
Rate at which radiation is emmited from surface per unit area
What is irradiation?
Rate at which radiation is incident upon a surface per unit area
What is radiosity?
Rate at which radiation leaves a surface per unit area
What is the view factor?
The view factor 𝐹𝑖𝑗 is a geometrical quantity corresponding to the fraction
of the radiation leaving surface 𝑖 that is intercepted by surface �
What is a diffusion surface?
A surface that does not have direction dependance for radiation.
What is a blackbody?
- For a prescribed wavelength and temperature, no surface can emit more radiation than a blackbody
– Ideal Emitter
– Diffuse Emitter
– Ideal Absorber
What is a grey body?
A blackbody up to a certain difference characterized by the emissivity coefficient. This coefficient depends on the matter but is independent of wavelength and direction.
