期刊
PHYSICAL REVIEW LETTERS
卷 94, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.064501
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We investigate the early stages of mass convection in a colloidal suspension at high solutal Rayleigh number (Ra) over cap (s). From the time evolution of shadowgraph images and by assuming a diffusive growth of the boundary layers we obtain an indirect measurement of the concentration boundary layer thickness delta(*) at the onset of convection. We show that the dimensionless boundary layer thickness delta = delta(*)/d scales as Ra-s(-p), where Ra-s = (Ra) over cap (s)delta is a modified solutal Rayleigh number for convection which accounts for the actual density unbalance and d is the thickness of the sample layer. This scaling behavior is analogous to that reported at steady state for turbulent convection in simple fluids. We find p = 0.35, a value compatible with the exponent 1/3, reported for turbulent heat convection in simple fluids at steady state.
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