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The size of turbulent eddies close to a wall
Author(s) -
Lyons Stephen L.,
Nikolaides Christos,
Hanratty Thomas J.
Publication year - 1988
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690340606
Subject(s) - turbulence , dimensionless quantity , eddy , mechanics , flow (mathematics) , production (economics) , turbulence kinetic energy , physics , dissipation , thermodynamics , economics , macroeconomics
Coherent flow‐oriented structures, with a dimensionless spacing of λ + ≈ 100, observed close to a wall in turbulent flows are believed to control the production of turbulence. A 2 1/2 D computer model developed by Nikolaides is used to explain the dimensionless spacing of these structures. The calculations suggest that the net production of turbulence in the viscous wall region is sensitive to changes in λ + in the neighborhood of λ + ≈ 100. They indicate that the net production is negative for λ + < 85 and that for λ + = 93 the net production is large enough to supply the turbulent energy dissipated in the outer flow.