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A Computational Assessment of Gas Jets in a Bubbly Co-Flow

Excerpt

In this effort, Computational Fluid Dynamics (CFD) is used to investigate the dynamics of gas jetted into an internal pipe flow. Specifically, we aim to understand the resulting cavity and resulting interaction modes that drive the gas to mix with the exterior flow. In order to vary the bubbly flow, the pipe fluid is treated as a weighted mixture of air and water with the volume fraction of air being a controlled variable. The velocity of the external flow and the mass flow rate of the air jetted in the flow are also varied to obtain a global understanding of the variation. These variations indicate the occurrence of several flow regimes of the primary cavity forming at the jet exit, as the jet gas interacts with the bulk pipe flow. Results of the weighted air/water mixture are compared to previous results involving only water as the bulk pipe flow. The overall results provide insight into the various flow regimes that occur.

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