A Research For Freezing Process Of Food With Regular Shape

It is very necessary to have a research on the process of food freezing, because frozen food industry is one of the most rapid industry of food in the world. The food freezing time and speed have the crucial effect to the quality of freeze foods, so it is worthy for the found of new foods freezing product line to predict freezing time exactly and simulate the foods freezing procedure dynamically. The most remarkable characteristic of the food-frozen process is the coexistence of solid and liquid phase and the phase transition from liquid to solid. The difficulties are the influence of the convection of liquid phase-change latent heat on temperature field and the confirmation of phase-change interface. So the numerical analytical method is the best method for studying freezing process. The freezing model is confirmed without considering the influence pf convection and mass transfer. On base of the disperse analysis on freezing model, the variety of physical parameter of the food on temperature is considered. The concept of equivalent specific heat is introduced. The simulation of the food-frozen process is realized by means of employing Matlab on account of its powerful numerical calculation and function of visible graphic data. Then we get the curve graphic of the physical parameter change along with the temperature, the curve of the food-frozen and the time-elapsing graphic of the phase transition interface. The results of the numerical experiment and the freezing experiment accomplished indicate that the simulation program is appropriate on special conditions.