界面厚度对果汁等温结晶冰晶生长影响的相场法模拟

田妍基; 陈锦权; 陈梅英

doi:10.19303/j.issn.1008-0384.2016.09.015

界面厚度对果汁等温结晶冰晶生长影响的相场法模拟

doi: 10.19303/j.issn.1008-0384.2016.09.015

田妍基^1,,
陈锦权²,
陈梅英^{2, 3, ,}

1.
宁德职业技术学院, 福建福安 355000
2.
福建农林大学食品科学学院, 福建福州 350002
3.
福建农林大学管理学院旅游学院, 福建福州 350002

基金项目:

国家自然科学基金项目 31101327

高等学校博士学科点专项科研基金博导类资助项目 20123515110016

食品生物技术校级示范专业和校级优秀教学团队建设项目 2015

详细信息

作者简介:
田妍基(1981-),女,硕士,讲师,主要从事食品加工与营养研究(E-mail:tyj6285268@126.com)

通讯作者:
陈梅英(1972-),女,副教授,博士,主要从事食品工程与旅游食品安全研究(E-mail:cmy2816@126.com)

中图分类号: TS275.5
计量
- 文章访问数: 1237
- HTML全文浏览量: 160
- PDF下载量: 259
- 被引次数: 0
出版历程
- 收稿日期: 2016-05-12
- 修回日期: 2016-06-05
- 刊出日期: 2016-09-28

Phase-field Simulation of Ice Crystal Growth by Interfacial Thickness Influence on Juice Isothermal Crystallization Process

1.
Ningde Vocational and Technical College, Fu'an, Fujian 355000, China
2.
College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
3.
Management College & Tourism college, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China

摘要

摘要: 将果汁体系视为水和溶质组成的二元系统，采用相场法模拟二元系统的相变微观结构，研究了等温结晶过程中，界面厚度对冰晶生长的形貌及溶质分布的影响，确定模型中界面厚度的合理取值。结果表明：界面厚度对冰晶的形貌有正负影响。在扰动干扰的范围内，二次枝晶随着界面厚度的增大而越来越发达，枝晶尖端也尖锐；在扰动干扰范围外，晶粒不产生二次枝晶，同时主轴枝晶变细，部分主轴枝晶消失。界面厚度取值越大，晶粒生长速率越快，而枝晶尖端半径减小。界面厚度取值在3 dx左右能较好地反应枝晶生长形貌及提高计算效率。
- 相场法 /
- 界面厚度 /
- 等温结晶 /
- 冰晶生长
Abstract: The phase-field model which coupled the concentration field and phase field is applied to simulate microstructure evolution during crystal growth of juice binary in 2-D, exploring the process of fruit juice crystallization. In this paper, the influence of interfacial thickness on ice crystal growth morphology and solute distribution was investigated, and a reasonable value of interfacial thickness was estimated. The simulated results showed that the interfacial thickness had positive and negative effects on ice crystal morphology.In the range of disturbance, the secondary dendrite became more and more developed and the dendrite tip was also more sharper with the increase of the interfacial thickness. Outside the range of disturbance, the secondary dendrite didn't grow, and the principal axis of the dendrite became thin and even some disappeared. The growth speed of ice crystal would increase and the tip radius would decreased with the increase of interfacial thickness.When the interfacial thickness was around 3dx, the best simulation result of the dendrite morphology and high calculation efficiency could be obtained.
- phase-field /
- interfacial thickness /
- isothermal crystallization /
- crystal growth

HTML全文

图 1 界面厚度λ对冰晶形貌的影响

注：(a)λ=1.5dx；(b)λ=3dx；(c)λ=4dx；(d)λ=4.5dx；(e)λ=5dx。图 2同。

Figure 1. Influence of interfacial thickness on ice crystal pattern

下载: 全尺寸图片幻灯片

图 2 界面厚度λ对冰晶溶质分布的影响

Figure 2. Influence of interfacial thickness on distribution of solute field

下载: 全尺寸图片幻灯片

表 1 蔗糖水溶液的物性参数

Table 1. Average parameters of sucrose solution

物性参数	取值
界面能σ/(J·m^-2)	0.0765
固相溶质扩散系数D_S/(m²·s^-1)	2.5×10^-11
液相溶质扩散系数D_L/(m²·s^-1)	5.6×10^-10
凝固潜热L_m /(kJ·kg^-1)	334.4
熔点温度T_m /K	273.15
液相线斜率m^e	1808^*^[35]
平衡常数k^e	0.075
注：表中数据参照文献^[35]计算得到。

下载: 导出CSV

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