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Vortex shedding and turbulence scales in staggered tube bundle flows
Author(s) -
Balabani S.,
Ylannekis M.
Publication year - 1997
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450750502
Subject(s) - strouhal number , turbulence , bundle , transverse plane , vortex shedding , mechanics , vortex , physics , dissipation , flow (mathematics) , computational fluid dynamics , computational physics , reynolds number , materials science , thermodynamics , engineering , composite material , structural engineering
Time‐resolved LDA measurements of the axial and transverse velocity components were performed in the first 6 rows of a staggered tube bundle with relative transverse and longitudinal pitch ratios of 3.6 and 1.6, respectively. Measurements were carried out in a flow of water at a Re d of 12,858. A flow periodicity with a Strouhal number equal to 0.26 was detected, which is in agreement with published data. This periodicity was found to broaden the turbulence levels by up to 50% in some locations. Agreement between the experimental results and previously reported CFD predictions using the k ‐ ϵ model improved when this periodic component was removed from the spectra using appropriate filtering techniques. In an attempt to describe the turbulence structure more extensively, time‐ and length‐scales and dissipation rates were estimated from the filtered time‐resolved data. Integral time scales were on average equal to 4 ms and Taylor microscales 0.7 ms. Comparisons of the data with numerical predictions show promise for more extensive evaluation of CFD predictions in hture than has been possible hereto.