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• W2942693411 abstract "Continuous release of gas bubbles in large numbers from a localized source in a liquid column, popularly known as bubble plumes, is very relevant in nature and industries. The bubble plumes morphologically consist of a long continuous stem supporting a dispersed head. Through our direct numerical simulations using two-way coupled Euler-Lagrangian framework, we show that a bubble plume rising in a quiescent liquid column develops clusterlike instabilities for the Grashof numbers, Gr>145. For levels Gr<100, the stem is continuous with a small plume head, whereas at high buoyancy (Gr>350), the plume stem shows intermittently passing puffing instabilities in the form of bubble clusters. The clusters are a group of bubbles localized in space with high concentration that travel upward with speed C_{ph}=0.45U_{C} and are separated by a distance of at least 5L_{0}, where U_{C} is the characteristic velocity and L_{0} is the characteristic length based on the injection conditions. The bubble rise Reynolds numbers in the steady state for both the plume head and the stem shows Re∝Gr^{0.45±0.03}, and the proportionality constant is ten times higher in the plume stem than in the plume head. In the plume core, the spatial acceleration due to the bubble motion generates the turbulent production, whereas, at the plume edge, the small-scale fluctuations generate the mean vorticity. At high Gr, the clusters evolve due to the lift forces acting on the bubbles as a result of increase in the mean vorticity. While rising, bubbles entrain the liquid from the surroundings, and we found that the entrainment rate is not as strong as compared to the classical thermal plumes." @default.
• W2942693411 created "2019-05-09" @default.
• W2942693411 creator A5021710661 @default.
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• W2942693411 date "2019-05-01" @default.
• W2942693411 modified "2023-10-06" @default.
• W2942693411 title "Clusterlike instabilities in bubble-plume-driven flows" @default.
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• W2942693411 doi "https://doi.org/10.1103/physreve.99.053101" @default.
• W2942693411 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31212562" @default.
• W2942693411 hasPublicationYear "2019" @default.
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