Publications
1987
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4.(1987) Nuclear Physics B - Proceedings Supplements. 2, p. 109-123 Abstract
Review of recent experimental results on stationary and oscillatory convection in binary mixtures and comparison with theory are presented. Effect of the cell geometry, in particular cell width, and the value of the separation ratio ψ on the onset of spatio-temporal chaotic behaviour above threshold is studied. Possible relation of complex pattern behaviour to the Benjamin-Feir turbulence in 2D cell geometry is discussed.
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3.(1987) Physical review letters. 58, 13, p. 1332-1335 Abstract
We present experimental measurements of the velocity of a convective vortex front propagating into an unstable conductive state in a Rayleigh-Bénard system for the wide range of μ (μ"T/"Tc-1) between 4×10-4 and 2.5×10-1. The results are found to be in excellent quantitatitve agreement with the theoretical predictions following from an amplitude equation, exhibiting a sharp selection mechanism in the propagation velocity. Wave-number selection by this dynamical mechanism is also studied.
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2.(1987) Physical Review Letters. 58, 4, p. 377-380 Abstract
We report experimental results for the thermal boundary resistance RK between gold and superfluid He4 which were obtaiend by the use of thermometry with 3-nK resolution. The data imply that RK is singular at the superfluid transition temperature T. Comparison with theory suggests that the singularity results from a hydrodynamic effect proposed by Landau, and that it is associated with the vanishing of the superfluid and normal-fluid currents at the boundaries.
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1.(1987) Physical Review A. 35, 6, p. 2757-2760 Abstract
A novel localized structure of traveling waves (TWs) was observed at convection onset in ethanol-water mixtures. It is one of various possible flow patterns of TWs which were observed. We find that for almost-one-dimensional cell geometry unique dynamics of transient behavior (in the form of two counterpropagating TWs) can lead to various stable states.