Abstract
The structure of the convective motion, which takes place after the vertical channel filled with two layers of miscible liquids is translated into a horizontal position, was studied experimentally. The characteristics and stability of the main flow were examined under various density differences and thicknesses of the channel. It is shown that the movement of the displacement front observed in all experiments can be described with a single curve by using certain nondimensional coordinates and time. It was found that an increase of density difference leads to instability of the main flow. This results in the appearance of a secondary flow in the form of helical convective rolls which form inside the mixing zone. Possible mechanisms responsible for the occurrence of such instability are discussed.
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