摘要： 为了解决冷冻浓缩造成的冰晶夹带且难以分离造成果汁可溶性固形物的损失而限制其推广的问题，采用描述相变微观结构的相场模型，从微观上模拟冰晶生长的演变过程。采用耦合温度场方程，模拟了非等温结晶过程冰晶的生长过程，研究了流场对冰晶生长形貌和温度场分布情况的影响，将流场作用下等温与非等温结晶冰晶生长过程进行了比较，分析了冰晶结晶过程中潜热的释放对流场作用下冰晶生长情况的影响。结果表明：非等温结晶过程能够获得形貌逼真的枝晶，但枝晶没有等温模拟时发达，并且初生冰晶长度比较小。非等温模拟时的温度场分布与枝晶生长相吻合。
关键词： 相场法；非等温结晶；冰晶生长
评职称论文发表网

CHEN Meiying^1,， CHEN Jinquan^2,*

（  1、Management College & Tourism college. Fujian Agriculture and Forestry University, Fuzhou 350002, China；       2、College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China；  ）

Abstract： In order to simulate the evolution of ice crystal growth from the microscopic, the phase-field model theory which had been used in the phase transition of microscopic structure was used to stimulate the ice growth. Applying coupling temperature field equation to the dendrite growth of crystal was simulated using the non-isothermal model. The difference in dendrite growth and temperature distribution were investigated. The result of dendrite growth during isothermal and non-isothermal crystallization were compared. The effect of latent heat on the crystal growth under convection was analyzed. Results showed that the dendrite growth of crystallization simulated by the non-isothermal model was more authentic, but the crystal was not as strong as using isothermal model. The fresh crystal was small. The temperature distribution was similar to the growth of crystal growth. 
Keywords： phase-field; non-isothermal crystallization; crystal growth