Research Article
In Situ Bioremediation of Crude Petroleum Oil Polluted Soil Using Mathematical Experimentation
Table 3
Relations for diffusion in porous solids [
18].
| | Mechanism | Equations | Applies to |
| | Bulk diffusion in pores | | Gases or liquids in large pores | | Knudsen diffusion | in m2/s
| Dilute (low pressure) gases in small pores
| | Combined bulk and Knudsen diffusion |
|
| | Surface diffusion |
| Adsorbed gases and vapours
= fractional surface coverage 0.6 |
|
|
