Graphical method to determine the constant parameters
in the Khazaei model (Eq. [3])
In the Khazaei model, time of relaxation, Trel, is the time required to reach
the moisture content of the product to about 63% of the total removed moisture,
Mrel (Fig. 1).
In other words, Trel shows the rate of drying seeds in the first phase
of process.
The highest amount of this term shows the lower rate of drying in the
first phase of the process.
Therefore, Krel shows the rate of drying in the relaxation
phase and is calculated by determining the slope of the tangent line on the end
part of the drying curve (Figure 1).