Speaker
Bernhard Mehlig
(University of Gothenburg)
Description
Spatial clustering of identical particles falling through a
turbulent aerosol enhances the collision rate between the
falling particles, an important problem in aerosol science.
We analyse this problem using perturbation theory in a
dimensionless parameter, the so-called Kubo number. This
allows us to derive an analytical theory quantifying the
spatial clustering. We find that clustering of small
particles in incompressible random velocity fields may be
reduced or enhanced by the effect of gravity, depending on
the Stokes number of the particles and the Froude number of
the flow. This work was performed in collaboration with K.
Gustavsson (University of Gothenburg).
