Transition from the ballistic to the diffusive regime in a turbid medium
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Updated: Jun 2, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
Andre Yaroshevsky1, Ziv Glasser, Er'el Granot
1Department of Electrical and Electronics Engineering, Ariel University Center of Samaria, Ariel 44837, Israel. andrey@ariel.ac.il
Abstract:
By varying the absorption coefficient and width of an intralipid-India ink solution in a quasi-one-dimensional experiment, we investigate the transition between the ballistic and the diffusive regimes. The medium's attenuation coefficient changes abruptly between two different values within a single mean free path. This problem is analyzed both experimentally and theoretically, and it is demonstrated that the transition location depends on the scattering coefficient as well as on the measuring solid angle.
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