| 摘要: |
| 针对冷冻浓缩工艺因冰晶夹带造成果汁中可溶性固形物损失的问题,以荔枝汁为研究对象,探讨冷冻浓缩过程冰晶生长的影响因素。在采用冷冻浓缩动力学模型进行分析的基础上,借鉴国内外金属微观结构研究领域的相场模型,模拟冰晶生长的规律。结果表明:冰晶增长速率与冰晶质量成正比,同时也受最大冰晶质量的抑制。相场模拟冷冻时间越长,降温速率越大,冰晶枝状越发达,引起冰晶的夹带率越高,果汁可溶性固形物损失越大。 |
| 关键词: 荔枝 冷冻浓缩 冰晶生长 动力学模型 相场模拟 |
| DOI：10.11841/j.issn.1007-4333.2011.02.022 |
| 投稿时间：2010-06-12 |
| 基金项目:福建省自然科学基金项目(2009J01233) |
|
| Kinetic model and phase-field of freeze concentration of litchi juice |
|
CHEN Mei-ying1,2, CHEN Jin-quan2, CHEN Yong-xue3
|
| (1.College of Economics and Management,Fujian Agriculture and Forestry University,Fuzhou 350002,China;2.College of Food Science,Fujian Agriculture and Forestry University,Fuzhou 350002,China;3.College of Computer and Information,Fujian Agriculture and Forestry University,Fuzhou 350002,China) |
| Abstract: |
| In this paper,litchi juice was used to investigate the loss of soluble solid by ice crystal entrainment and the influence on the growing rate of ice crystals during freeze concentration,based on which the mechanism of formation of ice was studied.Based on the analysis of the freeze concentration kinetic model established,authors utilized the phase-field model theory,which has been widely used in the metal microscopic structure field at home and abroad,to stimulate the ice crystal growth.The results showed that the growing rate of ice was proportional to the mass of ice in the juice and was inhibited by the maximum mass of ice crystal.The result also showed that branches were grew out from round ice crystals with the increasing of freezing time and cooling rate;the more the branches,the more ice crystals entrainment,which resulted in the more loss of soluble solid in juices. |
| Key words: litchi freeze concentration ice crystal growth kinetic model phase-field model |
