气体射流冲击干燥猕猴桃片的复水动力学特性及数学模型

摘要

To investigate the effect of drying conditions and rehydration temperatures on the rehydration kinetics,the moisture absorption curves of different conditions of dried kiwifruit slices were tested.Besides,the effects of different rehydration temperature at 30,50 and 70 ℃ were also determined.The Peleg,Weibull and Proposed model were used to fit the rehydration process.The result indicated that the rehydration rate increased with the increase of drying air temperature and air speed,and the decrease of nozzle height.Moreover,the higher the rehydration temperature,the quicker the rehydration process.It was found that Peleg,Weibull and Proposed model can all describe the rehydration process,but Weibull model was the best fitted model and it was more suitable for describing the rehydration kinetics of dried kiwifruit slices.%为了研究不同干燥条件和复水温度对猕猴桃片复水动力学的影响,实验监测了不同条件干燥猕猴桃片在相同复水温度下的吸湿曲线,并采用不同复水温度(30、50、70℃)对干制猕猴桃进行复水.此外,采用Peleg、Weibull、Proposed三个经典模型对干燥猕猴桃片的复水动力学进行拟合及验证.结果表明,干燥风温、风速以及喷嘴高度对产品的复水特性均有影响;复水速率随着风温、风速的增加和喷嘴高度的降低而增加.不同复水温度下,复水温度越高复水速率越快.Peleg、Weibull和Proposed模型均能有效描述猕猴桃干片的复水过程,其中Weibull模型具有最好的拟合度,其预测值与实验值呈良好的一致性,更适合于描述猕猴桃干片的复水动力学.