Diffusivity of solutes in freezing process of gelatin model immerged in quaternary refrigerant liquids

作者：Zeng, Qing-Xiao; Ni, Ming-Long; Zhu, Zhi-Wei^*; Chen, Bin; Han, Guang-He

来源：Journal of South China University of Technology(Natural Science Edition), 2010, 38(12): 115-119.

DOI：10.3969/j.issn.1000-565X.2010.12.022

• Cylinder model
• Dynamic viscosities
• Freezing conditions
• Freezing process
• Initial temperatures
• Propylene glycols
• Refrigerant liquids
• Solution concentration

In order to reveal the diffusivity of solutes from the solution of quaternary refrigerant liquid to food in freezing process, the freezing process of gelatin in different conditions was investigated, and the influences of such immersion chilling and freezing variables as temperature, freezing time and total concentration on the absorption of NaCl, ethanol, propylene glycol and the total absorption were analyzed on a gelatin cylinder model. Moreover, the density and dynamic viscosity of the refrigerant liquid were measured. The results indicate that (1) the absorption of NaCl, ethanol and propylene glycol as well as the total absorption remarkably improves; (2) the diffusivity of the solutes decreases at low initial temperature; (3) high solution concentration may result in higher total absorption; and (4) in the freezing conditions of -40~-20°C in this work, the total absorption is found to be only 2.70~6.23 mg/g after 25 min.

• 出版日期2010-12
• 单位华南理工大学