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Research Papers: Fundamental Issues and Canonical Flows

Parameters Affecting Bubble Formation and Size Distribution From Porous Media

[+] Author and Article Information
Thomas G. Shepard

School of Engineering,
University of St. Thomas,
2115 Summit Avenue,
Mail OSS 100,
St. Paul, MN 55105
e-mail: thomas.shepard@stthomas.edu

Jaiho Lee

Korea Hydro & Nuclear Power Co.,
508 Keumbyeong-ro,
Yuseong-gu, Daejeon 305-343, South Korea
e-mail: jaiho.lee@khnp.co.kr

Bo Yan

Mechanical Engineering Department,
University of Minnesota,
111 Church St. SE,
Minneapolis, MN 55455
e-mail: yanxx109@umn.edu

Paul J. Strykowski

Mechanical Engineering Department,
University of Minnesota,
111 Church St. SE,
Minneapolis, MN 55455
e-mail: pstry@umn.edu

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 19, 2014; final manuscript received August 25, 2015; published online October 9, 2015. Assoc. Editor: Mark R. Duignan.

J. Fluids Eng 138(3), 031202 (Oct 09, 2015) (8 pages) Paper No: FE-14-1686; doi: 10.1115/1.4031534 History: Received November 19, 2014; Revised August 25, 2015

This paper describes the experiments designed to control bubble size during gas injection through porous media into liquid cross flow. A parametric study examined the effect of control variables on average bubble size and standard deviation. Results showed that for a given air and liquid flow rate, changing liquid channel height at the air injection site had the largest effect on bubble size and size distribution while varying porous media grade and electrolyte concentration had smaller, though significant, effects. In this study, the channel height was varied from 0.8 to 8 mm, porous media grade from 0.5 to 100 and salt concentration varied from zero to 3%. The resulting average bubble diameters were 0.085–2.5 mm.

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Figures

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Fig. 1

Flow apparatus showing (a) exploded view of channel construction and (b) detailed view of section used to accelerate liquid past a porous plate to control liquid velocity and bubble formation. The actual facility is oriented vertically as indicated by the gravity arrow.

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Fig. 2

Experimental apparatus

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Fig. 3

Measurement of bubbles: (a) original image, (b) image with lines drawn (white used for clarity), and (c) measured bubbles

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Fig. 4

Representative images showing range of average bubble sizes produced by setup: (a) Db-avg = 0.16 mm and (b) Db-avg = 1.19 mm

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Fig. 5

Bubble size distributions for varying channel gap height (media grade = 10, salinity = 1.5%, pressure = 276 kPa, air flow rate = 1.6 SLPM, liquid flow rate = 2.8 LPM)

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Fig. 6

Effect of channel gap height on mean bubble diameter and normalized standard deviation (media grade = 10, salinity = 1.5%, pressure = 276 kPa, air flow rate = 1.6 SLPM, liquid flow rate = 2.8 LPM)

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Fig. 7

Effect of salinity on mean bubble diameter and normalized standard deviation (media grade = 10, channel gap height = 4 mm, pressure = 276 kPa, air flow rate = 1.6 SLPM, liquid flow rate = 2.8 LPM)

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Fig. 8

Effect of porous plate media grade on mean bubble diameter and normalized standard deviation (channel gap height = 4 mm, salinity = 1.5%, pressure = 276 kPa, air flow rate = 1.6 SLPM, liquid flow rate = 2.8 LPM)

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Fig. 9

Dependence of similarity parameters for bubble formation from porous plate in cross flow (salinity = 1.5%, pressure = 276 kPa, air flow rate = 1.6 SLPM, liquid flow rate = 2.8 LPM)

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