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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.60
pages 64-74

Turbulence Intensity in Fully Developed Turbulent Flow in an Eccentric Annulus

Fumimaru Ogino
Department of Chemical Engineering, Kyoto University, Kyoto, Japan
T. Kimura
Department of Chemical Engineering, Kyoto University, Kyoto, Japan

RESUMO

A measurement was made of stream wise velocity fluctuation in a fully developed turbulent flow in an eccentric annulus. The experiment was performed utilizing two annular ducts of different radius ratios 0.308 and 0.48; in each case the eccentricity was varied from 0.25 to 0.75. The result indicates that the radial distribution of the relative turbulence intensity has a minimum value in the central region between inner and outer tubes. The variation of the relative turbulence intensity against φ has a peak value near φ = 3π/8, where φ is the circumferential coordinate of the bipolar coordinate system. The location of the minimum turbulence intensity approaches the radial position nearest the outer tube wall when the value of φ is close to 3π/8. Those results indicate that there is some difference between two regions of φ < 3π/8 and φ > 3π/8.


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