In this paper, Direct Numerical Simulation (DNS) and Lagrangian Particle Tracking are used to investigate dispersion and deposition of particles swarms in convective flow confined in a cylindrical domain with aspect ratio (diameter over height) 0.5. The numerical simulations are carried out with Prandtl and Rayleigh numbers respectively equal to Pr = 0.7 and Ra = 2108. For these values of aspect ratio, Rayleigh and Prandtl numbers the flow is turbulent and time-dependent. In such flow, three sets of particles with Stokes numbers, based on the large eddy time scale, equal to Stf = 0.01, Stf = 0.005 and Stf = 0.001 are randomly dispersed. Particles distribution in turbulent convective flow is highly inhomogeneous and shows the clustering correlated with the vortical structures. The level of clustering is computed with the deviation of particles probability density function (PDF) from Poisson distribution. With this technique is available the size of the cluster but their geometry is unknown. The organisation along lines, planes and surfaces was investigated using the fractal dimension of the cluster. Finally, the flow topology is studied to relate the particles dispersion to coherent flow structures.
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ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4750-0
PROCEEDINGS PAPER
Dispersion and Deposition of Particles in Rayleigh-Be´nard Turbulent Flows Available to Purchase
Paolo Oresta,
Paolo Oresta
Politecnico di Bari, Taranto, Italy
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Antonio Lippolis,
Antonio Lippolis
Politecnico di Bari, Taranto, Italy
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Roberto Verzicco,
Roberto Verzicco
Politecnico di Bari, Taranto, Italy
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Alfredo Soldati
Alfredo Soldati
Universita` degli Studi di Udine, Udine, Italy
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Paolo Oresta
Politecnico di Bari, Taranto, Italy
Antonio Lippolis
Politecnico di Bari, Taranto, Italy
Roberto Verzicco
Politecnico di Bari, Taranto, Italy
Alfredo Soldati
Universita` degli Studi di Udine, Udine, Italy
Paper No:
FEDSM2006-98243, pp. 1703-1713; 11 pages
Published Online:
September 5, 2008
Citation
Oresta, P, Lippolis, A, Verzicco, R, & Soldati, A. "Dispersion and Deposition of Particles in Rayleigh-Be´nard Turbulent Flows." Proceedings of the ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. Volume 1: Symposia, Parts A and B. Miami, Florida, USA. July 17–20, 2006. pp. 1703-1713. ASME. https://doi.org/10.1115/FEDSM2006-98243
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