Point-source inertial particle dispersion |
| |
Authors: | Marco Martins Afonso Andrea Mazzino |
| |
Institution: | 1. INP/UPS/CNRS, Institut de Mécanique des Fluides de Toulouse – Groupe Particules Spray et Combustion , Université de Toulouse , allée du Professeur Camille Soula, 31400 Toulouse, France marcomar@fisica.unige.it;3. Department of Physics , University of Genova , Genova, Italy;4. CNISM &5. INFN , Genova Section, via Dodecaneso 33, 16146 Genova, Italy |
| |
Abstract: | The dispersion of inertial particles continuously emitted from a point source is analytically investigated in the limit of small but finite inertia. Our focus is on the evolution equation of the particle joint probability density function p(x,?v,?t), x and v being the particle position and velocity, respectively. For arbitrary inertia, position and velocity variables are coupled, with the result that p(x,?v,?t) can be determined by solving a partial differential equation in a 2d-dimensional space, d being the physical-space dimensionality. For small (but nevertheless finite) inertia, (x,?v)-variables decouple and the determination of p(x,?v,?t) is reduced to solve a system of two standard forced advection–diffusion equations in the space variables x. The latter equations are derived here from first principles, i.e., from the well-known Lagrangian evolution equations for position and particle velocity. |
| |
Keywords: | Multiphase and particle-laden flows Mixing Turbulent flows |
|
|