Modeling of laser radiation transport in powder beds with high-dispersive metal particles

Two-dimensional transfer of laser radiation in a high-dispersive powder heterogeneous media is numerically calculated. The size of particles is comparable with the wave length of laser radiation so the model takes into account all known physical effects that are occurred on the vacuum–metal surface interface. It is shown that in case of small particles size both morphology of powder particles and porosity of beds influence on absorptance by the solid phase and laser radiation penetrate deep into the area of geometric shadow. Intensity of laser radiation may be described as a function corresponded to the Beer–Lambert–Bouguer law.

► Transport of laser energy in dispersive powder beds was numerically simulated.
► The results of simulating are compared with physicals experiments.
► We established the dependence of the extinction coefficient from powder properties.
► A confirmation of a geometric optic approach for monodisperse powders was proposed.