食品科学 ›› 2007, Vol. 28 ›› Issue (11): 33-36.

• 基础研究 •    下一篇

无定形食品物理老化过程的数值研究

 高才, 刘向农, 王铁军, 华泽钊   

  1. 合肥工业大学机械与汽车工程学院; 上海理工大学低温医学与食品冷冻研究所 安徽合肥230009; 安徽合肥230009; 上海200093;
  • 出版日期:2007-11-15 发布日期:2011-11-22

Numerical Exploration of Physical Aging in Amorphous State Foods

 GAO  Cai, LIU  Xiang-Nong, WANG  Tie-Jun, HUA  Ze-Zhao   

  1. 1.School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009, China; 2.Institute of Cryomedicine and Food Refrigeration, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Online:2007-11-15 Published:2011-11-22

摘要: 为了估算无定形食品的老化时间,利用数值方法考察了升降温速率和Adam-Gibbs(AG)模型参数对连续升降温无量纲比热容的影响。结果表明,升降温速率会对计算结果产生明显影响,获得的松弛参数要给出是在何种升降温速率下获得的。AG模型参数表现出很强的相关性,如果四个模型参数同时作为自由变量可能会得到不合理结果。通过和实验数据的对照,发现本研究的分析结果对于大致估算AG模型参数有一定指导意义。

关键词: 无定形食品, 物理老化, 差示扫描量热法

Abstract: In order to estimate the physical aging time of amorphous state foods, numerical method based on the Adam-Gibbs enthalpy relaxation theory was used to observe the effects of cooling/heating rates and model parameters on the normalized specific heat capacities. The results indicated that different cooling and heating rates produce different values of model parameters. The parameters of AG model correlate strongly and at least one parameter can be fixed before the search routine. The results of present study can predict experimental data very well and be used to make rapid estimation of the physical aging time.

Key words: amorphous state foods, physical aging, differential scanning calorimetry(DSC)