Abstract
In this experimental investigation we analyze the nature of the primary instability of a bubbly mixing layer. We consider upward flows that develop in a vertical channel of finite dimensions, with bubbles injected on one side of the mixing layer at the inlet. The induced buoyancy effect generates longitudinal accelerations, which are at the origin of self-excited large-scale oscillations under certain conditions. We provide experimental evidence that these oscillations are global modes, and we develop a simple model able to predict the conditions of appearance of these global modes. The model includes as essential mechanisms the buoyancy and a transverse mass transfer due to liquid miscibility in the mixing layer.
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