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Interfacial structure in an air–water planar bubble jet

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Abstract

The objective of the current study is to better understand the interfacial structure and its development in an air–water planar bubble jet, as well as to provide a unique benchmark data set for a 3D thermal-hydraulic analysis code. Both flow visualization and local measurements were performed in three characteristic flow conditions at four elevations along a test section with a cross section of 200 mm in width and 10 mm in gap. A high-speed digital video camera was applied in the flow visualization study to capture the flow structures and bubble interaction phenomena, while a miniaturized four-sensor conductivity probe was used to acquire the time-averaged local void fraction, interfacial velocity, and bubble number frequency. Also, the interfacial area concentration and the averaged bubble Sauter mean diameter were obtained from the local measurements. The lateral bubble transport and bubble interaction mechanisms were clearly demonstrated in the acquired data.

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Abbreviations

A :

Cross-sectional area (m2)

a i :

Interfacial area concentration (1/m)

D d, max :

Maximum distorted bubble limit (m)

D h :

Hydraulic diameter of test section (m)

D sm :

Sauter mean diameter of bubbles (m)

f :

Parameter in Eq. 2

G :

Gap of test section (m)

g :

Gravitational acceleration (m/s2)

j :

Volumetric flux (superficial velocity) (m/s)

L :

Vertical distance from the inlet of the test section (m)

N :

Bubble number frequency (1/s)

v :

Velocity (m/s)

W :

Width of test section (m)

x :

Coordinate in width direction

y :

Coordinate in gap direction

z :

Coordinate in axial direction

α :

Void fraction

σ :

Surface tension (N/m)

Δρ:

Density difference between two phases (kg/m3)

0:

Gas property at standard condition

1:

Group-1 bubbles

2:

Group-2 bubbles

f :

Liquid phase

g :

Gas phase

x :

Distribution in x direction

< >:

Area averaging

<< >>:

Void-weighted area averaging

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Acknowledgements

This work was performed under the auspices of Bechtel Bettis Inc. The authors at Purdue University greatly appreciate this support.

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Author notes

  1. X. Sun

    Present address: Department of Mechanical Engineering, The Ohio State University, 650 Ackerman Road, Columbus, OH, 43202, USA

  2. S. Kim

    Present address: Nuclear Engineering, University of Missouri–Rolla, Fulton 219, Rolla, MO, 65409, USA

Authors and Affiliations

  1. School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN, 47907, USA

    X. Sun, S. Vasavada, S. W. Choi, S. Kim & M. Ishii

  2. Bechtel Bettis Inc., P.O. Box 79, West Mifflin, PA, 15122, USA

    S. G. Beus

Authors
  1. X. Sun
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  2. S. Vasavada
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  3. S. W. Choi
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  4. S. Kim
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  5. M. Ishii
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  6. S. G. Beus
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Correspondence to X. Sun.

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Sun, X., Vasavada, S., Choi, S.W. et al. Interfacial structure in an air–water planar bubble jet. Exp Fluids 38, 426–439 (2005). https://doi.org/10.1007/s00348-004-0921-0

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  • DOI: https://doi.org/10.1007/s00348-004-0921-0

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