Thermal convection in binary fluid mixtures with a weak concentration diffusivity, but strong solutal buoyancy forces -: art. no. 046302

被引:55
作者
Ryskin, A [1 ]
Müller, HW
Pleiner, H
机构
[1] Max Planck Inst Polymer Res, D-55021 Mainz, Germany
[2] Univ Saarland, Theoret Phys, D-66041 Saarbrucken, Germany
来源
PHYSICAL REVIEW E | 2003年 / 67卷 / 04期
关键词
D O I
10.1103/PhysRevE.67.046302
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Thermal convection in binary liquid mixtures is investigated in the limit where the solutal diffusivity is weak, but the separation ratio is large. Representative examples are colloidal suspensions such as ferrofluids. With a grain size being large on molecular length scales, the particle mobility is extremely small, allowing to disregard the concentration dynamics in most cases. However, this simplification does not hold for thermal convection: Due to the pronounced Soret effect of these materials in combination with a considerable solutal expansion, the resulting solutal buoyancy forces are dominant. Indeed, convective motion is found to set in at Rayleigh numbers well below the critical threshold for single-component liquids. A nonlinear analysis demonstrates that the amplitude quickly saturates in a state of stationary convective motion.
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收藏
页码:8 / 463028
页数:8
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