界面各向异性影响冰晶生长的相场法研究

Study on interface anisotropy influencing on ice crystal growth using phase-field model

采用Wheeler模型对果蔬速冻保鲜工艺中的冰晶生长过程进行模拟,研究了各向异性模数、界面能各向异性强度对冰晶生长行为的影响。结果表明:当各向异性模数在(2,6]之间取值时,随着各向异性模数的减小,冰晶形貌的对称性重数降低;在各向异性模数取6时,随着界面能各向异性强度的增加,冰晶形貌由六角星向六重对称发达枝晶转变。因此,通过降低各向异性模数和界面能各向异性强度,能够抑制大冰晶的形成。

The Wheeler model was used to simulate ice crystal growth in fruit and vegetable quick -freezing and preservation process. The effect of anisotropy modulus and interface energy anisotropy strength on the behavior of ice crystal growth was studied. The result shows that when the value of anisotropy modulus among the range of （2,6], with a decrease in anisotropy modulus, the multiplicity of ice crystal morphology is decreased. With an increase in interface energy anisotropy strength, the morphology of ice crystal changes from six corners -star to the developed dendrite morphology present obvious six -fold symmetry. Therefore, large ice crystal formation will be inhibit of by reducing the anisotropy modulus and interface energy anisotropy strength.