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TECHNICAL PAPERS

Phase Distribution in the Cap Bubble Regime in a Duct

[+] Author and Article Information
Martin Lopez de Bertodano

Department of Nuclear Engineering, Purdue University, West Lafayette, IN 47907bertodan@purdue.eduDepartment of Mechanical Engineering, Ohio State University, Columbus, OH 43202bertodan@purdue.eduDepartment of Nuclear Engineering, Purdue University, West Lafayette, IN 47907bertodan@purdue.edu Bechtel-Bettis, Inc., West Mifflin, PA 15122bertodan@purdue.edu

Xiaodong Sun, Mamoru Ishii, Asim Ulke

Department of Nuclear Engineering, Purdue University, West Lafayette, IN 47907Department of Mechanical Engineering, Ohio State University, Columbus, OH 43202Department of Nuclear Engineering, Purdue University, West Lafayette, IN 47907 Bechtel-Bettis, Inc., West Mifflin, PA 15122

J. Fluids Eng 128(4), 811-818 (Jan 31, 2006) (8 pages) doi:10.1115/1.2201626 History: Received August 31, 2004; Revised January 31, 2006

The lateral phase distribution in the cap-bubbly regime was analyzed with a three-dimensional three-field two-fluid computational fluid dynamics (CFD) model based on the turbulence model for bubbly flows developed by Lopez de Bertodano [1994, “Phase Distribution in Bubbly Two-Phase Flow in Vertical Ducts  ,” Int. J. Multiphase Flow, 20(5), pp. 805–818]. The turbulent diffusion of the bubbles is the dominant phase distribution mechanism. A new analytic result is presented to support the development of the model for the bubble induced turbulent diffusion force. New experimental data obtained by Sun [2005, “Interfacial Structure in an Air-Water Planar Bubble Jet  ,” Exp. Fluids, 38(4), pp. 426–439] with the state-of-the-art four-sensor miniature conductivity probe in a vertical duct is used to validate the three-field two-fluid model CFD simulations.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of the experimental loop

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Figure 2

Schematic of the miniaturized four-sensor conductivity probe

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Figure 3

(a) Flow structure visualization (z∕D=35), (b) flow structure visualization (z∕D=142)

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Figure 4

(a) Small bubble void fraction along the centerline in the width direction (jL=0.946 and jG=0.19m∕s), (b) cap bubble void fraction along the centerline in the width direction (jL=0.946 and jG=0.19m∕s)

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Figure 5

(a) Small bubble interfacial area concentration along the centerline in the width direction (jL=0.946 and jG=0.19m∕s), (b) cap bubble interfacial area concentration along the centerline in the width direction (jL=0.946 and jG=0.19m∕s)

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Figure 6

(a) Small bubble velocity along the centerline in the width direction (jL=0.946 and jG=0.19m∕s), (b) cap bubble velocity along the centerline in the width direction (jL=0.946 and jG=0.19m∕s)

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Figure 7

(a) Numerical convergence test: volume fraction, (b) numerical convergence test: velocity

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Figure 8

Contour plots of volume fraction of the cap bubbles (a) jG=0.19m∕s, (b) jG=0.19m∕s, aspect ratio not to scale

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Figure 9

Comparison of cap bubble phase distribution

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Figure 10

Comparison of small bubble phase distribution

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Figure 11

Comparison of small bubble phase distribution, including lift (z∕D=142)

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Figure 12

Comparison of small bubble phase distribution, including lift (z∕D=35)

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Figure 13

Comparison of cap bubble velocity distribution

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Figure 14

Comparison of small bubble velocity distribution

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