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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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Published on: May 9, 2021

Evolution of energy in flow driven by rising bubbles.

Irene M Mazzitelli¹, Detlef Lohse

¹Department of Science and Technology, J. M. Burgers Centre for Fluid Dynamics, University of Twente, 7500 AE Enschede, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|August 8, 2009

Summary

Simulations show rising bubbles generate large-scale fluid motion via an inverse energy cascade. However, bubble lift forces prevent efficient energy accumulation and uniform spreading, hindering turbulence development.

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Area of Science:

Fluid Dynamics
Multiphase Flow
Computational Physics

Background:

Rising bubbles in quiescent fluids create complex flow patterns.
Understanding bubble-induced turbulence is crucial for various industrial and natural phenomena.
Previous studies often simplified bubble interactions and forces.

Purpose of the Study:

To investigate the fluid flow generated by rising bubbles using direct numerical simulations.
To analyze the energy cascade and bubble distribution mechanisms.
To explore the impact of bubble lift forces on flow dynamics.

Main Methods:

Eulerian-Lagrangian method with two-way coupling.
Simulations treated bubbles as point particles, disregarding near-field interactions.
Used effective force models for lift and drag, with a constant lift coefficient of 1/2.

Main Results:

Observed generation of large-scale motions attributed to an inverse energy cascade.
Identified uniform bubble spreading due to shear-induced lift forces, preventing cluster formation.
Found that disabling lift forces enhanced energy accumulation at large scales.

Conclusions:

The study highlights the role of bubble lift in regulating energy transfer and preventing efficient forcing in bubble-driven flows.
The findings suggest that bubble interactions significantly influence the development of turbulence characteristics.
Uniform spreading of bubbles, driven by lift forces, limits the formation of strong vortices and efficient energy cascade.