Experimental study and modelling of the ice crystal morphology of model standard ice cream. Part II: Heat transfer data and texture modelling

Quantitative analysis of the mean size of ice crystals is mainly based on h eat transfer modelling during the freezing process. So, during this work a standard dairy ice cream was frozen in a freezing device that ensured a uni -directional heat transfer. The temperature profiles inside the frozen ice cream were recorded; these data obtained for different cooling temperatures and for different initial temperatures led to the freezing front rate and the freezing front temperature. Then. these results were interpreted using the Neumann model that allowed to calculate the thermal gradients near the interface in the frozen or in the unfrozen zone. Finally, these results wer e used to fit empirically the ice crystal mean size as a function of the fr eezing front rate and of the thermal gradient in the frozen zone. Another t ype of empirical correlation including the distance to the cooling plate an d the Neumann parameter delta was proposed. (C) 2001 Elsevier Science Ltd. All rights reserved.