两层和多层结构中盐指现象的数值模拟

Numerical study of salt-figuring phenomenon of bilayer and multilayer structure

采用COMSOL有限元数值模拟的方法,研究了两层各自均匀溶液模型中不同参数对盐指现象的影响。结果表明,系统的热瑞利数RT、盐瑞利数RS、初始密度稳定率Rρ0均影响界面处产生的盐指现象。当RT、Rρ0增加时,盐指增长的速度会变慢,盐指的数量增多;当RS增加而Rρ0减小时,盐指增长的速度变快,盐指的数量增多;并且在RS增大到某一值(或Rρ0减小到某一值)时,盐指的性质会发生突变。进一步提出并研究了多层溶液结构模型中的盐指现象,结果表明相邻界面之间的相互作用对盐指的产生及形状有着重要的影响。

The finite element method numerical simulation（COMSOL）is used to investigate the influent of parameter on salt-figuring phenomenon between homogeneous layers of solution.The results show that thermal Rayleigh numbers RT、salinity Rayleigh numbers RSand initial density stability ratio Rρ0all influence the salt-figuring phenomenon.When both RTand Rρ0increase,the salt-figuring pattern emerges more slowly,and the number of figuring shaped pattern increase.When the RSincrease but Rρ0decrease,the salt-figuring pattern emerges more quickly,and the number of figuring shaped pattern are also increased.In addition,there are phase transition of salt-figuring property while the RS is large enough.The study of multilayer salt-figuring phenomenon shows that the affection between adjacent interface are important to the shape and growth of salt-figuring.