过冷度影响海水结冰形状与速度的相场模拟
收稿日期: 2020-03-19
网络出版日期: 2021-06-01
基金资助
国家自然科学基金(51879125);江苏省高等学校自然科学研究重大项目(18KJA580003);江苏省“六大人才高峰”高层次人才项目(2018-KTHY-033);江苏省研究生科研与实践创新计划项目(SJKY19_2664)
Simulation of Undercooling Influence on Shape and Velocity of Seawater Freezing Process Using Phase Field Method
Received date: 2020-03-19
Online published: 2021-06-01
为了研究船舶结构结冰的微观机理,进行了模拟计算.基于Wheeler相场模型,使用有限差分法,对不同过冷度下海水凝固形状进行模拟.在模拟过程中,将海水视为盐和纯水的二元混合物,通过设置冰物理参数和引入晶核方式保证了冰晶生长的真实性.计算时,设置4个晶核模拟冰晶生长,讨论不同过冷度对冰晶生长的影响.结果表明:冰晶生长速度随过冷度增加而增加,且与过冷度变化呈线性关系.当无量纲过冷度小于0.85时,枝晶仅有少量分枝,且枝干较细.当无量纲过冷度大于0.85时,冰晶出现二级以上的多级分枝,且枝干明显变粗.当无量纲过冷度达到1.0时,分枝受到主枝挤压而减少,晶核之间最终被填满.
白旭, 杨苏杰 . 过冷度影响海水结冰形状与速度的相场模拟[J]. 上海交通大学学报, 2021 , 55(5) : 513 -520 . DOI: 10.16183/j.cnki.jsjtu.2020.077
In order to study the microcosmic mechanism of ice formation in ship structure, a numerical simulation is conducted. Based on the Wheeler phase field model, the finite difference method is used to simulate the solidification shape of seawater at different undercoolings. In the process of simulation, sea water is regarded as the binary mixture of salt and pure water, and the authenticity of ice crystal growth is ensured by setting ice physical parameters and introducing crystal nucleus. In the calculation, four nuclei are set up to simulate the ice crystal growth, and the influence of different undercoolings on the ice crystal growth is discussed. The results show that the growth rate of ice crystal increases with the increase of undercooling, and it is linear with the change of undercooling. When the dimensionless undercooling is less than 0.85, the dendrite has only a few branches which are thin. When the dimensionless undercooling is higher than 0.85, the ice crystal has more than two-stages of branches which are obviously thicker. When the dimensionless undercooling reaches 1.0, the branches are squeezed by the main branches and lessned, and the crystal cores are finally filled.
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