Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-06-18
Phys. Rev. E 78, 031121 (2008)
Physics
Condensed Matter
Soft Condensed Matter
9 pages, 6 figures
Scientific paper
10.1103/PhysRevE.78.031121
We study photon diffusion in a two-dimensional random packing of monodisperse disks as a simple model of granular media and wet foams. We assume that the intensity reflectance of disks is a constant. We present an analytic expression for the transport-mean-free path in terms of the velocity of light in the disks and host medium, radius and packing fraction of the disks, and the intensity reflectance. For the glass beads immersed in the air or water, we estimate transport-mean-free paths about half the experimental ones. For the air bubbles immersed in the water, transport-mean-free paths is an inverse function of liquid volume fraction of the model wet foam. This throws new light on the empirical law of Vera et. al, and promotes more realistic models.
Miri MirFaez
Nakhaee Sareh
Sadjadi Zeinab
Shaebani Reza M.
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