Table 3 Coefficients for the Valcam (40 and 70 °C) and Midilli (50 and 60 °C) models (a); and enthalpy (ΔH), entropy (ΔS) and Gibbs free energy (ΔG) values for the different drying conditions of Rue (Ruta chalepensis L.) leaves (b).
From: Drying kinetics, thermodynamic properties and physicochemical characteristics of Rue leaves
Mathematical models (a) | ||||||||
|---|---|---|---|---|---|---|---|---|
Temperature (°C) | Midilli | Valcam | ||||||
a | b | k | n | a | b | c | d | |
40 | – | – | – | – | 0.991** | − 0.190** | 0.045** | –0.003** |
50 | 0.992** | − 0.004** | 0.409** | 1.301** | – | – | – | – |
60 | 0.986** | 0.005* | 0.698** | 1.394** | – | – | – | – |
70 | – | – | – | – | 0.998** | − 1.018** | 0.351** | 0.015** |
Thermodynamic properties (b) | ||||||||
|---|---|---|---|---|---|---|---|---|
Temperature (°C) | ΔH (kJ mol−1) | ΔS (kJ mol−1 K−1) | ΔG (kJ mol−1) | |||||
40 | 57.973 | − 0.28538 | 147.341 | |||||
50 | 57.890 | − 0.28564 | 150.196 | |||||
60 | 57.806 | − 0.28590 | 153.053 | |||||
70 | 57.723 | − 0.28614 | 155.913 | |||||
