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Effective diffusion coefficient Deff and tortuosity factor τ of samples and related parameters 1 of methylene blue elution.
| ID | δ (mm) | α | m2″ (min−1) | m3″ (min) | Deff (m2 s−1) | τ | Leff/L |
|---|---|---|---|---|---|---|---|
| a | 1.331 | 0.436 | 0.0609 | 14.3 | 2.8 × 10−11 | 7.3 | 2.7 |
| b | 2.015 | 0.447 | 0.0403 | 38.6 | 2.8 × 10−11 | 7.3 | 2.7 |
| c | 2.701 | 0.453 | 0.0327 | 39.2 | 2.9 × 10−11 | 7.3 | 2.7 |
1δ, sample thickness; α, porosity; m2″, true elution rate constant; m3″, true delay time; L, thickness of diffusion layer; Leff, actual diffusion distance.
