Inertial-particle dispersion and diffusion

• Type: Article in International Conference Proceedings Book
• Date: 2011

Authors

Afonso, MM (Author) Other; Mazzino, A (Author) Other; Muratore Ginanneschi, P (Author) Other

Conference proceedings International

Title: 13TH EUROPEAN TURBULENCE CONFERENCE (ETC13): PARTICLES IN TURBULENCE, TRANSPORT PROCESSES AND MIXING

13th European Turbulence Conference (ETC)

Univ Warsaw, Warsaw, POLAND, SEP 12-15, 2011

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-00N-NM6

DOI: 10.1088/1742-6596/318/5/052014

Abstract (EN): We analytically investigate the dynamics of inertial particles in incompressible flows in the limit of small but finite inertia, focusing on two specific instances. First, we study the concentration of particles continuously emitted from a point source with a given exit velocity distribution. The anisotropy of the latter turns out to be a necessary factor for the presence of a correction (with respect to the corresponding tracer case) at order square root of the Stokes number. Secondly, by means of a multiple-scale expansion, we analyse the particle effective diffusivity, and in particular its dependence on Brownian diffusivity, gravity effects and particle-to-fluid density ratio. In both cases, we obtain forced advection-diffusion equations for auxiliary quantities in the physical space, thus simplifying the problem from the full phase space to a system which can easily be solved numerically.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4