Numerical simulation and optimization of ice slurry filling process for pre-cooled packaging of broccoli in stacked cartons
Ice slurry is a novel refrigerant with pumpable and high cooling capacity.It holds broad prospects in the field of pre-cooling for fruits and vegetables packaging.The evenness of ice crystal distribution and mass of ice crystal in the packaging box are the key factors affecting the pre-cooling effect of fruits and vegetables.This study focused on multi-story boxes containing broccolis.It utilized computation-al fluid dynamics(CFD)simulations to analyze how icing process parameters affect the evenness and mass of ice crystals inside the packa-ging box.Then,the article conducted experimental validation,and subsequently determined the optimal icing process parameters using the response surface analysis method.The results indicate that,under conditions of equal ice crystal volume fraction and icing time,icing speed and icing angle significantly influence the evenness and mass of ice crystals inside the box.Rapid filling ice and a large tilting angle will decrease the mass of ice crystals in the upper layer of the box and also reduce the evenness of ice crystal distribution.Both scenarios are unfavorable for the pre-cooling and low-temperature storage of broccoli inside the box.There is a synergistic interaction among icing an-gle,icing speed,and icing time.The effect of filling angle is the largest,and the effect of filling time is the smallest.The article employed response surface analysis to construct a regression equation and determine the optimal icing process parameters for broccoli:the ice filling Angle is 19.165°,the ice filling speed is 2.447 m/s.This provides technical support for the application of slurry pre-cooling packaging in multi-story boxes containerized fruits and vegetables.
万方数据
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