Characteristics of turbulent mass transfer around a rotating circular cylinder have been investigated by Direct Numerical Simulation. The concentration field was computed for three different cases of Schmidt number, Sc = 1, 10 and 100 at ReR* = 336. Our results confirm that the thickness of the Nernst diffusion layer decreases as Sc increases. Wall-limiting behavior within the diffusion layer was examined and compared with that of channel flow. Concentration fluctuation time scale was found to scale with r+2, while the time scale ratio nearly equals the Schmidt number throughout the diffusion layer. Scalar modeling closure constants based on gradient diffusion models were found to vary considerably within the diffusion layer. Results of an octant analysis show the significant role played by the ejection and sweep events just as is found for flat plate, channel, and pipe flow boundary layers. Turbulence budgets revealed a strong Sc dependence of turbulent scalar transport.
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e-mail: ksyang@inha.ac.kr
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August 2011
Research Papers
Effects of Schmidt Number on Turbulent Mass Transfer Around a Rotating Circular Cylinder
Kyung-Soo Yang,
e-mail: ksyang@inha.ac.kr
Kyung-Soo Yang
Department of Mechanical Engineering, Inha University
, Incheon, 402-751, Republic of Korea
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Klaus Bremhorst
Klaus Bremhorst
Division of Mechanical Engineering,
The University of Queensland
, Brisbane, Qld 4072, Australia
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Kyung-Soo Yang
Department of Mechanical Engineering, Inha University
, Incheon, 402-751, Republic of Korea
e-mail: ksyang@inha.ac.kr
Klaus Bremhorst
Division of Mechanical Engineering,
The University of Queensland
, Brisbane, Qld 4072, Australia
J. Fluids Eng. Aug 2011, 133(8): 081204 (11 pages)
Published Online: August 23, 2011
Article history
Received:
February 3, 2011
Revised:
July 2, 2011
Online:
August 23, 2011
Published:
August 23, 2011
Citation
Yoon, D., Yang, K., and Bremhorst, K. (August 23, 2011). "Effects of Schmidt Number on Turbulent Mass Transfer Around a Rotating Circular Cylinder." ASME. J. Fluids Eng. August 2011; 133(8): 081204. https://doi.org/10.1115/1.4004635
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