Abstract
Buoyancy driven mixing of two fluids in a 2D closed cavity is simulated with a two-fluid model. The predictions are compared with a set of experimental data. The experiment involves flow visualization of the mixing process and application of the image processing technique to determine the mixing characteristics. The measurements and predictions include the interface evolution, interface elongation, and mixing width. Two Grashof numbers based on the initial density gradient, Gr=3.7×10 5, 3.7×10 3 and two valve speeds, 0 and 5 cm/s are considered. The predictions are generally in good agreement with the experimental data.
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