Study on Light-Heat Property of Porous Surface of Materials

Adopting the method of ray tract,the equivalent absorptivity function of rays energy of the surface porous flat is modelled,and the influencing factors of equivalent absorptivity discussed in this paper.The result shows that the equivalent absorptivity of the surface porous flat has a linear relation to the surface porosity and has nothing to do with the hole size.The equivalent absorptivity increases with the surface porosity,the degree of which is related to incidence angle of light and the material inherence absorptivity.The equivalent absorptivity of the surface porous flat can increase more 30% than that of smooth flat while the material inherence absorptivity is in the range of 0.2～0.6.The equivalent absorptivity increases fastly with the incidence angle of light in the range of 40°～75°,while it increases slowly in the case of incidence angle more than 75°and less than 40°.