Abstract

Traveling-wave convection in an ethanol–water mixture confined in a narrow rectangular cell of height:width aspect ratio 1:0.3 is studied using shadowgraph flow visualization. We are able to identify qualitatively the contributions to the shadowgraph intensity due to the concentration field in the convecting mixture. The measured shadowgraph intensities and traveling-wave frequencies share features with the results of numerical calculations, which assume an infinitely wide cell, and of experiments done in wider cells, but there are significant quantitative differences, apparently due to our highly constrained geometry.

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