Diffusivity of Two-Phase 3D Models.

Effective diffusivities of our proposed two-phase 3D models are compared to the HS upper bound and to the experimentally observed effective diffusivity of brain tissue. Cubes have a fixed size (L×L×L), long cuboids are any permutation of a cuboid of size 2L×2L×L, and short cuboids are any permutation of a cuboid of size 2L×L×L.