熟肉真空冷却过程中水分迁移理论分析和实验(简报)

    Theoretic analysis and experimental study on the mechanism of moisture movement during vacuum cooling of cooked meat

    • 摘要: 真空冷却过程是复杂的相变传热传质过程。该文在能量和质量守恒理论的基础上,经过适当的简化,建立熟肉真空冷却过程中水分迁移的数学模型来分析水分迁移机理。利用圆柱形熟肉块的真空冷却实验来验证真空冷却过程中水分迁移的数学模型以获得真空冷却过程中熟肉的温度和压力的变化。结果分析发现:温度的模拟结果与实验数据基本一致,最大误差在5%以内,这表明此模型能够很好地预测真空冷却过程中熟肉内部的温度和压力分布。而且,通过模拟结果和实验数据可以得知:真空冷却过程中水分从熟肉内部向外部迁移的主要驱动力是熟肉内部之间的压差以及熟肉与真空室内之间的压差。因此,在实际应用过程中,为了提高真空冷却速率,应尽可能降低真空室内的压力以增加水分迁移的驱动力。

       

      Abstract: Vacuum cooling is a complicated heat and mass transfer process. Based on the theory of energy and mass balance, a simplified moisture movement model for vacuum cooling of cooked meat was developed. Vacuum cooling of cooked meat with cylindrical shape was carried out to obtain the variations of temperature and pressure. From the results, it can be found that the simulation results of temperature agree with the experimental data well, the maximum deviation between the simulated and the experimental data is within 5%, which shows that moisture movement model can be used to predict the temperature and pressure distributions within cooked meat during vacuum cooling. In addition, the calculated and experimental results suggest that total pressure differences within cooked meat and between cooked meat and vacuum chamber are the major driving forces. Therefore, in order to increase vacuum cooling rate, the pressure in the vacuum chamber should be reduced for the increment of driving forces of moisture movement during vacuum cooling of cooked meat.

       

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