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Clusterlike instabilities in bubble-plume-driven flows.

Sai Ankit Etha1, Anupam Jena1, Rajaram Lakkaraju1

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|June 20, 2019
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Summary
This summary is machine-generated.

Bubble plumes exhibit cluster-like instabilities at higher Grashof numbers (Gr>145). These bubble clusters form and travel upwards, influencing plume dynamics and turbulence production in liquids.

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Area of Science:

  • Fluid Dynamics
  • Multiphase Flow
  • Bubble Dynamics

Background:

  • Bubble plumes are crucial in natural and industrial settings, characterized by a stem and head.
  • Understanding their instabilities is key to predicting their behavior.

Purpose of the Study:

  • To investigate the development of instabilities in bubble plumes using numerical simulations.
  • To characterize the formation, behavior, and impact of bubble clusters.

Main Methods:

  • Direct numerical simulations employing a two-way coupled Euler-Lagrangian framework.
  • Analysis of bubble plume behavior across various Grashof numbers (Gr).

Main Results:

  • Cluster-like instabilities emerge for Gr > 145, with puffing instabilities observed at Gr > 350.
  • Bubble clusters travel at 0.45 times characteristic velocity (Uc) and exhibit high spatial concentration.
  • Bubble rise Reynolds numbers correlate with Grashof numbers (Re∝Gr^0.45±0.03), with higher values in the plume stem.

Conclusions:

  • Bubble plume dynamics are significantly influenced by cluster formation at higher Grashof numbers.
  • Turbulence production and vorticity generation are linked to bubble motion and cluster evolution.
  • Entrainment rates in bubble plumes are less pronounced than in thermal plumes.