Soret driven convection in a colloidal solution heated from above at very large solutal Rayleigh number

Details Soret driven convection in a colloidal solution heated from above at very large solutal Rayleigh number Soret driven convection in a colloidal solution heated from above at very large solutal Rayleigh number

2002-10-02

arxiv.org/abs/cond-mat/0210053v1

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 4 figures

Scientific paper

10.1103/PhysRevE.66.055301

Convection in a colloidal suspension with a large negative separation ratio is studied experimentally by heating from above. Shadowgraph observation at very large solutal Rayleigh numbers are reported as a function of time. Fast relaxation oscillations are reported for the root mean square value of the shadowgraph intensity. While pure fluids exhibit a transition to turbulent convection for Rayleigh number of about 10^6, stable spoke-pattern planform with up and down columnar flows are observed up to solutal Rayleigh numbers of the order of 10^9. It is suggested that the surprising stability of the planform against turbulence is due to nonlinear focusing arising from the concentration dependence of the diffusion coefficient.

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