Recent results from direct numerical simulations of deformable bubbles in turbulent flows in vertical channels are discussed. The results show that the lateral migration of the bubbles due to lift forces controls the flow. For upflow, nearly spherical bubbles form a dense bubbly wall-layer but more deformable bubbles stay away from the walls, resulting in very different flow structures and flow rates. The different flow regimes have a very simple structure, but to understand them it is necessary to examine the collective motion of many bubbles rather than individual ones. Here, the effect of bubble deformability and Reynolds number are discussed.
- Fluids Engineering Division
DNS Studies of Turbulent Bubbly Flows in Vertical Channels
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Tryggvason, G, Dabiri, S, & Lu, J. "DNS Studies of Turbulent Bubbly Flows in Vertical Channels." Proceedings of the ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 2: Fora. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 187-191. ASME. https://doi.org/10.1115/FEDSM2012-72111
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