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Effective diffusivity obtained for mint under different operating conditions.
| Flow type | Covering material | R2 | Effective diffusivity (Deff) (m2 s−1) |
|---|---|---|---|
| Natural convection | Direct dryer | 0.9296 | 1.29 × 10−11 |
| Indirect dryer | 0.918 | 1.2 × 10−11 | |
| Forced convection | Direct dryer | 0.9057 | 1.33 × 10−11 |
| Indirect dryer | 0.9061 | 1.21 × 10−11 |
