It is evident
from the contours that geometric center of sample happens to be
slowest heating zone. Thus, this model can be used to estimate
moisture content at particular region of food sample at any
instance of time. Also, the effect of different drying temperature
such as 52 C, 62 C and 72 C on porosity Vs moisture content
were studied using the developed model (Fig. 13). The Fig. 13
clearly depicted that the drying temperature had less influence
on porosity. Wang and Brennan (1995a,b) also observed the similar
trend in their model. Thus, the present study was focused on
potato drying and the results indicates that porosity is less dominant
than shrinkage (see Fig. 7), but combination of both porosity
and shrinkage shows higher influence on the predictions of moisture.
Hence, this model may be suitable for high porosity material
like apple. However, it is worth to check this hypothesis in future
studies.