CONVECTIVE PATTERNS IN A BINARY MIXTURE WITH A POSITIVE SEPARATION RATIO

被引:22
作者
BIGAZZI, P [1 ]
CILIBERTO, S [1 ]
CROQUETTE, V [1 ]
机构
[1] ECOLE NORM SUPER,LPS,F-75231 PARIS 05,FRANCE
来源
JOURNAL DE PHYSIQUE | 1990年 / 51卷 / 07期
关键词
D O I
10.1051/jphys:01990005107061100
中图分类号
学科分类号
摘要
We pesent an experimental study of the convective patterns and their dynamics occurring in a binary mixture presenting a positive separation ratio. In this situation, both the concentration and the temperature fields are destabilizing, and they lead to two different kinds of convective patterns. Using quantitative optical methods, we have measured the convective motion wavevectors and their non-linear amplitude. For small temperature differences, only the concentration field is destabilizing and the convective motions are organized in a square pattern. We study the evolution of the wavevector and the amplitude of the square pattern. For larger temperature differences both fields are destabilizing and we investigate the competition between the square pattern, reminiscent of the concentration field, and the roll pattern associated with the temperature field. By studying the dynamics of this competition we have evidenced the existence of traveling waves which have been recently predicted by Linz et al.
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页码:611 / 624
页数:14
相关论文
共 30 条
[1]   NONLINEAR-THEORY OF TRAVELING WAVE CONVECTION IN BINARY-MIXTURES [J].
BENSIMON, D ;
PUMIR, A ;
SHRAIMAN, BI .
JOURNAL DE PHYSIQUE, 1989, 50 (20) :3089-3108
[2]   CODIMENSION-2 BIFURCATIONS FOR CONVECTION IN BINARY FLUID MIXTURES [J].
BRAND, HR ;
HOHENBERG, PC ;
STEINBERG, V .
PHYSICAL REVIEW A, 1984, 30 (05) :2548-2561
[3]   NON-LINEAR CONVECTION IN A LAYER WITH NEARLY INSULATING BOUNDARIES [J].
BUSSE, FH ;
RIAHI, N .
JOURNAL OF FLUID MECHANICS, 1980, 96 (JAN) :243-256
[4]   EVOLUTION OF 2-DIMENSIONAL PERIODIC RAYLEIGH CONVECTION CELLS OF ARBITRARY WAVE-NUMBERS [J].
CHEN, MM ;
WHITEHEA.JA .
JOURNAL OF FLUID MECHANICS, 1968, 31 :1-&
[5]   REAL-TIME MEASUREMENTS OF OPTICAL DISUNIFORMITY FIELDS [J].
CILIBERTO, S ;
FRANCINI, F ;
SIMONELLI, F .
OPTICS COMMUNICATIONS, 1985, 54 (05) :251-256
[6]   OPTICAL STUDY OF A CONVECTIVE INSTABILITY IN A BINARY-LIQUID MIXTURE HEATED FROM ABOVE [J].
GIGLIO, M ;
VENDRAMINI, A .
OPTICS COMMUNICATIONS, 1977, 20 (03) :438-440
[7]   SORET-TYPE MOTION OF MACROMOLECULES IN SOLUTION [J].
GIGLIO, M ;
VENDRAMINI, A .
PHYSICAL REVIEW LETTERS, 1977, 38 (01) :26-30
[8]   TRAVELING WAVES AND SPATIAL VARIATION IN THE CONVECTION OF A BINARY MIXTURE [J].
HEINRICHS, R ;
AHLERS, G ;
CANNELL, DS .
PHYSICAL REVIEW A, 1987, 35 (06) :2761-2764
[9]   SORET-DRIVEN THERMOSOLUTAL CONVECTION [J].
HURLE, DTJ .
JOURNAL OF FLUID MECHANICS, 1971, 47 (JUN29) :667-&
[10]   THE TRANSITION FROM ROLL TO SQUARE-CELL SOLUTIONS IN RAYLEIGH-BENARD CONVECTION [J].
JENKINS, DR ;
PROCTOR, MRE .
JOURNAL OF FLUID MECHANICS, 1984, 139 (FEB) :461-471