particles, although heat transfer coeffcients are inde- pendent of material type; the food water content strongly affects freezing times, since when existing a higher water content, higher is the lapsed time during the phase change it should be noted that the highest percentage in the global freezing time corresponds to this stage).
Fig. 8 compares the experimental values with pre- dicted freezing times according to Nagoaka, Pham and Plank models. Data are means of triplicate experiments which had a variation that did not exceed the mean value by 5% in all cases.
It can be observed that predicted times are quite similar to the experimental values differences below 10%), especially for short freezing times. Plank's model underestimates freezing times, with 12% difference from experimental results. Freezing times predicted by Pham