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Statistics of particle accumulation in spatially developing turbulent boundary layers

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1750
pages 1715-1723

G. Sardina
Department of Mechanics and Aeronautics, "Sapienza" University of Rome, Via Eudossiana 18, 00184 Rome; UKE - Università Kore di ENNA Facoltà di Ingegneria, Architettura e Scienze Motorie, Via delle Olimpiadi, 94100 Enna, Italy

Phillipp Schlatter
Linne FLOW Centre and Swedish e-Science Research Centre (SeRC) KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Luca Brandt
Linné Flow Centre, KTH Mechanics, Osquars backe 18, SE-100 44 Stockholm, Sweden

Francesco Picano
Department of Mechanics and Aeronautics, "Sapienza" University of Rome, Via Eudossiana 18, 00184 Rome, Italy; KTH, Department of Mechanics SE-100 44 Stockholm, Sweden; Department of Industrial Engineering University of Padova Via Venezia 1, 35131, Padova, Italy

Carlo M. Casciola
Department of Mechanics and Aeronautics, 'Sapienza' University of Rome, Via Eudossiana 18, 00184 Rome, Italy

Dan S. Henningson
Linne FLOW Centre and Swedish e-Science Research Centre (SeRC) KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

要約

A Direct Numerical Simulation of a particle-laden spatially developing turbulent boundary layer up to Reθ = 2500 has been performed. The peculiar feature of a boundary layer flow seeded with heavy particles is the variation of the local dimensionless parameters defining the fluid-particle interactions along the streamwise direction. An inner and an outer Stokes number can be defined using inner and outer flow units. These two parameters show different decay rates in the streamwise direction so that it is possible to find a decoupled particle dynamics between the inner and the outer region of the boundary layer. Preferential near-wall particle accumulation is similar to that observed in turbulent channel flow, while a self-similar behavior characterizes the outer region.

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