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Wall Shear Effect on Bubble Formation in Turbulent Flows

[+] Author Affiliations
Thomas Shepard, Eric Ruud, Henry Kinane

University of St. Thomas, St. Paul, MN

Paper No. FEDSM2013-16232, pp. V01CT17A010; 9 pages
doi:10.1115/FEDSM2013-16232
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

Experimental bubble formation studies have been undertaken on air injection through a porous plate into fully developed turbulent salt-water flows in vertical rectangular channels of varying aspect ratio. This work was aimed at better understanding the effects of variables including pore size, channel size, channel pressure and gas-to-liquid mass flow ratio on the bubble size and bubble standard deviation. In this research, channel pressure was varied from 138–414 kPa (20–60 psi), the hydraulic channel diameter ranged from 1.82–10 mm which corresponded to aspect ratios from 10–1, mean porous plate pore sizes of 0.2 and 100 micron were used (media grade 0.2, 100) and liquid Reynolds numbers from 3400–30,000 were studied. Image processing techniques were used to measure bubble diameters from digital images taken of the bubbly flows which were back-lit via a high-intensity strobe light. The mean bubble diameters produced ranged from 106–1250 microns. Results show that the combined effects of channel pressure, channel geometry and flow rate on average bubble diameter can largely be captured by using wall shear stress at the air injection site whose calculation was based on previously published literature. Bubble diameter and standard deviation are reduced nonlinearly at higher wall shear stress and it is shown that for the bubbly flow regime the gas-to-liquid mass flow ratio has little effect on average bubble size over the conditions of this study.

Copyright © 2013 by ASME

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