earticle

영어

The principal objective of this study was to investigate changes in ice dendrite size during the freezing of tuna, inorder to formulate a mathematical model of ice dendrite size. The tuna was frozen via a uni-directional heat transfer.Thermogram analysis allowed us to determine the position of the freezing front versus time, which is referred to as thefreezing front rate. The morphology of the ice dendrites was assessed via scanning electron microscopy after freeze-drying,and the retained pore size was measured as ice dendrites. We noted that the mean size of ice dendrites increased with thedistance to the cooling plate; however, it decreased with reductions in the cooling rate and the cooling temperature. Inaddition, shorter durations of the freeze-drying process decreased the freezing front rate, resulting in a larger size of the icedendrite pores that operate as water vapor sublimation channels. According to our results, we could derive a linear regressionas an empirical mathematical model equation between the ice dendrite size and the inverse of the freezing front rate.