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Effect of Amplitude on Mass Transport, Void Fraction and Bubble Size in a Vertically Vibrating Liquid-Gas Bubble Column Reactor

[+] Author Affiliations
A. L. Still, A. J. Ghajar

Oklahoma State University, Stillwater, OK

T. J. O’Hern

Sandia National Laboratories, Albuquerque, NM

Paper No. FEDSM2013-16116, pp. V01CT17A004; 12 pages
doi:10.1115/FEDSM2013-16116
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

Two-phase and three-phase Bubble Column Reactors are used in many chemical, petroleum, and bio-systems processing applications such as the hydrogenation of coal slurry to produce synthetic fuels during the Fischer-Tropsch process. Vertical vibration of a BCR has previously been shown to increase mass transfer, increase void fraction, decrease bubble size and establish interesting flow phenomena through kinetic buoyancy or “Bjerknes force”. However, the effect of kinetic buoyancy on the flow field, mass transfer, and flow properties such as void fraction is not fully understood. While previous research has focused on the effect of vibration frequency (10 < f < 120 Hz) at low amplitudes, (A < 2.5 mm) very little attention has been given to the effect of larger amplitudes. Therefore, a new experimental set up was designed, built, verified by comparison to previous research, and used to collect mass transfer, void fraction, and bubble size data at high amplitude (2.5 mm < A < 9.5 mm) over a frequency range of 7.5–22.5 Hz. Comparison of the results with previous research shows similar local maxima occurring for void fraction and mass transfer, but that an optimum amplitude may exist for mass transfer which is independent of frequency. Statistical analysis and comparison of the results with data from the literature suggests a stronger relationship may exist between kinetic buoyancy and mass transfer than previously theorized.

Copyright © 2013 by ASME
Topics: Bubbles , Porosity

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