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Behavior of Levitated Bubbles Under Vibration

[+] Author Affiliations
T. J. O’Hern, B. Shelden, L. A. Romero, J. R. Torczynski

Sandia National Laboratories, Albuquerque, NM

Paper No. FEDSM2013-16056, pp. V01CT17A001; 9 pages
doi:10.1115/FEDSM2013-16056
From:
  • ASME 2013 Fluids Engineering Division Summer Meeting
  • Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Liquid-Solids Flows; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes; Transport Phenomena in Mixing; Turbulent Flows: Issues and Perspectives
  • Incline Village, Nevada, USA, July 7–11, 2013
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5556-0
  • Copyright © 2013 by ASME

abstract

Gas bubbles in liquid generally rise due to buoyancy but can be forced to move downward or to be stably levitated by subjecting the liquid to vibration (Jameson, 1966; Hashimoto and Sudo, 1980; Leighton et al., 1990; Brennen, 1995; Ellenberger and Krishna, 2007). We have performed experiments in a quasi-two-dimensional test cell in which the motion of bubbles can be observed and measured. This paper presents observations and data regarding the generation and motion of levitated bubbles when the vibration conditions are varied.

While bubble downward motion due to the Bjerknes force is well known at acoustic frequencies close to the bubble resonant frequency, these experiments, like those of Ellenberger and Krishna (2007), demonstrate that such effects can be observed at relatively low frequencies as well. Experiments were performed primarily in one of several thin, quasi-two-dimensional rectangular acrylic boxes partially filled with polydimethylsiloxane (PDMS) silicone oil or deionized water with ambient air above. The apparatus was subjected to sinusoidal axial vibrations for frequencies of 100–300 Hz, displacements up to 200 microns and accelerations up to 35 times standard gravity. Bubbles generated either by direct injection deep in the cell or by free-surface breakup into jets and droplets can, under appropriate vibration conditions, move downward in the test cell, where they are attracted together and merge to form a large coalesced bubble at the base of the cell. That large bubble can then rise until it reaches a location of stable levitation. The bubble damps free surface breakup above it. Under some vibration conditions, the levitated-bubble interface breakup is similar to the free surface breakup into jets and droplets.

Copyright © 2013 by ASME
Topics: Bubbles , Vibration

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