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**Harvard**

Schnitzer, B. (2017) *Collision rate of spheroids in turbulence*. Göteborg : Chalmers University of Technology

** BibTeX **

@mastersthesis{

Schnitzer2017,

author={Schnitzer, Barbara},

title={Collision rate of spheroids in turbulence},

abstract={Collisions of particles are of great importance in different processes in fluid flows,
like water droplets colliding in cumulus clouds forming rain, but also dust grains
that eventually form a planet. As a continuation of work that was done on spherical
particles I studied the collision rate of small spheroids in three qualitatively different
flows, namely in the kinetic limit, where particles move ballistically, in the shear
flow, where particles move uniformly, but can overtake each other, and in a smooth
random flow, which is a model for the small scales in turbulence. A corresponding
theoretical model that describes the two-dimensional collision rate was presented
and compared to simulation results. It was found that the particle shape has a
great influence on the collision rate in all cases. In general an increasing elongation
leads to a higher collision rate, while the two-dimensional shear flow was found to
be an exception in the sense that the collision rate approaches zero instead. Threedimensional
systems were investigated by simulations but not supported by a theory.},

publisher={Institutionen för fysik (Chalmers), Chalmers tekniska högskola},

place={Göteborg},

year={2017},

keywords={fluid dynamics, random flow, shear flow, spheroids, collisions.},

note={67},

}

** RefWorks **

RT Generic

SR Electronic

ID 253518

A1 Schnitzer, Barbara

T1 Collision rate of spheroids in turbulence

YR 2017

AB Collisions of particles are of great importance in different processes in fluid flows,
like water droplets colliding in cumulus clouds forming rain, but also dust grains
that eventually form a planet. As a continuation of work that was done on spherical
particles I studied the collision rate of small spheroids in three qualitatively different
flows, namely in the kinetic limit, where particles move ballistically, in the shear
flow, where particles move uniformly, but can overtake each other, and in a smooth
random flow, which is a model for the small scales in turbulence. A corresponding
theoretical model that describes the two-dimensional collision rate was presented
and compared to simulation results. It was found that the particle shape has a
great influence on the collision rate in all cases. In general an increasing elongation
leads to a higher collision rate, while the two-dimensional shear flow was found to
be an exception in the sense that the collision rate approaches zero instead. Threedimensional
systems were investigated by simulations but not supported by a theory.

PB Institutionen för fysik (Chalmers), Chalmers tekniska högskola,

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/253518/253518.pdf

OL 30