通电加热解冻的模拟电路模型及实验研究

Study on Circuit Model and Experiment of Ohmic Heating Thawing

通过建立的解冻槽内模拟电路模型 ,分析了肉在通电加热解冻过程中电能利用率、肉内产热量、肉两侧间电压的变化 ;随着肉的温度升高 ,肉的电阻降低 ,肉两侧的电压降低 ,肉内的产热量和电能利用率增大 ,并且肉最大面平行电场时的肉内产热量和电能利用率都高于垂直电场时 ;实验结果也表明肉最大面平行电场时的解冻速率也大于垂直电场时的解冻速率 。

A circuit analogy model for meat thawing in solution was developed. The voltage between two sides of meat, heat generation inside meat and energy usage rate were analyzed with the model. The resistance and voltage of meat decreased and the heat generation and energy usage rate increased, as the meat temperature increased. When the largest face of meat was parallel to the electric field, the heat generation and energy usage rate were higher than those when it was perpendicular to the field. The experimental results showed that when the largest face was parallel to the electric field, the thawing rate was faster than that when it was perpendicular to the field. The thawing rate of ohmic heating in salt solution was faster than that in tap water.