TRANSIENT DYNAMICS OF A CELLULAR FRONT INSTABILITY DURING DIRECTIONAL SOLIDIFICATION

被引：16

作者：

FIGUEIREDO, JMA

SANTOS, MBL

LADEIRA, LO

MESQUITA, ON

机构：

[1] Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte 30161-960, MG

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.71.4397

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first systematic transient dynamics measurements of a cellular instability during directional solidification on a nematic-isotropic interface of the liquid crystal 8cB. The time evolution of the most unstable spatial mode of the interface is well described by a third-order Landau-amplitude equation, as anticipated theoretically. Instability growth rates and nonlinear cubic coefficients are measured as a function of pulling velocity and temperature gradient. The results are compared with theories of directional solidification.

引用

页码：4397 / 4400

页数：4