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Research Papers

Hydrodynamic and Heat Transfer Effects of Varying Sparger Spacing Within a Column Photobioreactor Using Computational Fluid Dynamics

[+] Author and Article Information
Ghazi S. Bari

School of Mechanical and Materials Engineering,
Washington State University,
P.O. Box 642940,
Pullman, WA 99164
e-mail: GhaziSaiful.Bari@wsu.edu

Taylor N. Suess

Mem. ASME
Department of Mechanical Engineering,
South Dakota State University,
Crothers Engineering Hall 356,
Brookings, SD 57007
e-mail: Taylor.Suess@jacks.sdstate.edu

Gary A. Anderson

Department of Agricultural
and Biosystems Engineering,
South Dakota State University,
Agricultural Engineering Hall 115,
Brookings, SD 57007
e-mail: Gary.Anderson@sdstate.edu

Stephen P. Gent

Mem. ASME
Department of Mechanical Engineering,
South Dakota State University,
Crothers Engineering Hall 218,
Brookings, SD 57007
e-mail: Stephen.Gent@sdstate.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received May 30, 2014; final manuscript received August 13, 2014; published online November 25, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 12(1), 011004 (Feb 01, 2015) (10 pages) Paper No: FC-14-1069; doi: 10.1115/1.4028951 History: Received May 30, 2014; Revised August 13, 2014; Online November 25, 2014

This research investigates the placement of spargers on thermofluid effects within a column photobioreactor (PBR) using computational fluid dynamics (CFD). This study compares two configurations, each with three rows of spargers spaced at different widths: one with spargers spaced 7.62 cm apart and the other spaced 10.16 cm apart. These spargers are modeled in a PBR with overall dimensions of 34.29 cm in length, 15.25 cm in width, and 34.28 cm in height. The objective of this research is to predict the performance of PBRs using CFD, which can be used to improve the design of PBRs used to grow microalgae for biofuels and bioproducts.

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References

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Figures

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Fig. 1

Cross section schematic of laboratory scale PBR

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Fig. 2

(a) Volume meshes of isometric view (7.62 cm sparger spacing) and (b) volume meshes of isometric view (10.16 cm sparger spacing)

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Fig. 3

(a) Streamlines of bubble flow pattern of 7.62 cm sparger spacing at 1 l/min, 7 l/min, and 17 l/min volume flow rates with down flow along the outer walls of PBR and (b) streamlines of bubble flow pattern of 10.16 cm sparger spacing at 1 l/min, 7 l/min, and 17 l/min volume flow rates with internal circulation

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Fig. 4

(a) Velocity profile at 10 l/min volume flow rate for 7.62 cm sparger spacing and (b) velocity profile at 10 l/min volume flow rate for 10.16 cm sparger spacing

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Fig. 5

Relationship between gas hold-up and superficial gas velocity

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Fig. 6

Relationship between Reynolds number and superficial gas velocity

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Fig. 7

Temperature distribution at the center of PBR for 10 l/min flow rate for both sparger configurations

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Fig. 8

Relationship between average bubble Nusselt number and superficial gas velocity

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Fig. 9

Relationship between convective heat transfer coefficient and superficial gas velocity

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