Collision rate of spheroids in turbulence

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dc.contributor.authorSchnitzer, Barbara
dc.contributor.departmentChalmers tekniska högskola / Institutionen för fysik (Chalmers)sv
dc.contributor.departmentChalmers University of Technology / Department of Physics (Chalmers)en
dc.date.accessioned2019-07-03T14:41:19Z
dc.date.available2019-07-03T14:41:19Z
dc.date.issued2017
dc.description.abstractCollisions 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.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/253518
dc.language.isoeng
dc.setspec.uppsokPhysicsChemistryMaths
dc.subjectBuilding Futures
dc.subjectGrundläggande vetenskaper
dc.subjectHållbar utveckling
dc.subjectInnovation och entreprenörskap (nyttiggörande)
dc.subjectAnnan naturvetenskap
dc.subjectAnnan teknik
dc.subjectAnnan samhällsvetenskap
dc.subjectBuilding Futures
dc.subjectBasic Sciences
dc.subjectSustainable Development
dc.subjectInnovation & Entrepreneurship
dc.subjectOther Natural Sciences
dc.subjectOther Engineering and Technologies
dc.subjectOther Social Sciences
dc.titleCollision rate of spheroids in turbulence
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeComplex adaptive systems (MPCAS), MSc
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