Some of these samples reported included solid agar gel model samples (Kiani et al., 2012a), potato samples (Li and Sun, 2002), apple samples (Delgado et al., 2009), and so on. In the present study on radish samples, Fig. 4 showed the effect of ultrasound irradiation (0.26 W cm-2 at -0.5 C) for different ultrasound durations on the freezing curve and the coolant temperature variation.