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Título : | DNS experiments on the settling of heavy particles in homogeneous turbulence: two-way coupling and Reynolds number effects |
Autor : | Dejoan, Anne |
Palabras clave : | settling particles, homogeneous turbulence two-way coupling |
Fecha de publicación : | 2011 |
Editorial : | IOP |
Citación : | Anne Dejoan 2011 J. Phys.: Conf. Ser. 333 012006 |
Resumen : | The present study addresses the effects of two-way fluid-particle interaction (“two-
way coupling”) on the settling of heavy particles in homogeneous turbulence. The
modification of turbulence by the particles and the resulting effects on the settling
velocity are analyzed by taking into account Reynolds number effects. The turbulent
carrier fluid phase is resolved by direct numerical simulation (DNS) and the particle
phase by the Lagrangian point-particle approximation. Results are presented for two
Taylor microscale Reynolds numbers R λ = 40 and 130. While for R λ = 40 the
Kolmogorov time scale, t η , is found almost unaltered by the two-way coupling, it
is found significantly decreased for R λ = 130. The consequent modification of the
particle Stokes number St = τ p /t η , τ p being the particle response time, shows that
comparisons between one-way coupling numerical data and two-way coupling numerical
or experimental data may be inconsistent. This is particularly relevant for the particle
settling in turbulence which has been previously shown to be strongly influenced by
the dynamical interaction of the small flow scales with the particles. |
URI : | http://documenta.ciemat.es/handle/123456789/2063 |
Aparece en las colecciones: | Artículos de Energía
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