PIV velocity measurements in the wake of an obstruction simulating a Taylor bubble in a duct

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Mean velocity measurements in the wake of an obstruction simulating a Taylor bubble (or slug) have been obtained using Particle Image Velocimetry (PIV) in a duct. Two flow rates were established: one represented the flow behind a large gas slug rising in quiescent fluid and the other represented an idealized slug rising with a higher relative velocity, as typically found in higher void fraction churn-turbulent flow. The results indicate that, in a reference frame fixed to the slug, the flow around the sides of the slug behaves like wall bounded jets which eventually merge downstream of the slug. The ratio ... continued below

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[20] p.

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Vassallo, P. & Kumar, R. June 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 11 times . More information about this article can be viewed below.

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  • Knolls Atomic Power Laboratory
    Publisher Info: Knolls Atomic Power Lab., Schenectady, NY (United States)
    Place of Publication: Schenectady, New York

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Description

Mean velocity measurements in the wake of an obstruction simulating a Taylor bubble (or slug) have been obtained using Particle Image Velocimetry (PIV) in a duct. Two flow rates were established: one represented the flow behind a large gas slug rising in quiescent fluid and the other represented an idealized slug rising with a higher relative velocity, as typically found in higher void fraction churn-turbulent flow. The results indicate that, in a reference frame fixed to the slug, the flow around the sides of the slug behaves like wall bounded jets which eventually merge downstream of the slug. The ratio of wake volume to slug volume is nearly the same for both Reynolds numbers tested (i.e., 3.0 at Re = 3,628 and 2.9 at Re = 7.257) although the measurements suggest that the wake size decreases somewhat as the Reynolds number is increased.

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[20] p.

Notes

OSTI as DE99000446

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  • American Society of Mechanical Engineers (ASME) fluids engineering division summer meeting, Vancouver (Canada), 22-26 Jun 1997

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  • Other: DE99000446
  • Report No.: KAPL-P--000053
  • Report No.: CONF-970670--
  • Grant Number: AC12-76SN00052
  • Office of Scientific & Technical Information Report Number: 296643
  • Archival Resource Key: ark:/67531/metadc688702

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • May 16, 2016, 5:20 p.m.

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Vassallo, P. & Kumar, R. PIV velocity measurements in the wake of an obstruction simulating a Taylor bubble in a duct, article, June 1, 1997; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc688702/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.