Convective Instabilities in a Horizontal Binary Liquid Layer
The Soret-driven instability in a thin horizontal layer of a two-component liquid is studied both experimentally and theoretically. The experiment is performed on a dilute polymer solution by using the laser-beam deflection technique. At steady state above threshold, the horizontally-averaged concentration gradient observed at mid-height of the layer shows a saturation effect, and the mass convec-tive flux is found to depend linearly on the temperature difference between the plates. The approach to steady-state shows slowing down effects near threshold, whereas it is characterized by relaxation oscillations somewhat above threshold. The experimental results are in good agreement with a self-consistent single-mode dynamic model of the Soret-driven instability.
KeywordsConvective Instability Beam Deflection Dilute Polymer Solution Aluminum Alloy Plate Tration Gradient
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