1. Fractal dimension has been used to quantify tortuosity . 2. However, it is well known that tortuosity is not only a function of porosity. 3. Then the arc-chord ratio for each part is found and the tortuosity is estimated by: 4. This would imply that roughness ( or tortuosity ) could be measured by relative change of curvature. 5. However, several ways to adapt methods estimating tortuosity in 2-D have also been tried. 6. Intuitively, correlations of this form are a better model since it incorporates tortuosity information through F. 7. In pharmaceutical sciences, tortuosity is used in relation to diffusion-controlled release from solid dosage forms. 8. Higher tortuosity or curviness retards mass transfer as it acts obstructively on the drug particles within the formulation. 9. By assuming that the tortuosity \ tau is proportional to \ Phi ^ { 1-b }. 10. Strictly speaking, however, the effective diffusivity is proportional to the reciprocal of the square of the geometrical tortuosity
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