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| Titel |
Precipitation dendrites in turbulent pipe flows |
| VerfasserIn |
Luiza Angheluta, Christopher Hawkins, Øyvind Hammer, Bjorn Jamtveit |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084654
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| Zusammenfassung |
| Surface precipitation in pipelines, as well as freezing in water pipes is of great concern in
many industrial applications where scaling phenomena becomes a control problem of
pipe-clogging or an efficiency reduction in transport. Flow blockage often occurs even when
only a small fraction is deposited non-uniformly on the walls in the form of dendrites.
Dendritic patterns are commonly encountered in surface precipitation from supersaturated
solutions, e.g. calcite dendrites, as well as in solidification from undercooled liquids, e.g.
freezing of water into ice dendrites.
We explore the mathematical similarities between precipitation and freezing processes
and, in particular, investigate the effect of fluid flow on the precipitation dendrites on pipe
walls. We use a phase field approach to model surface growth coupled with a lattice
Boltzmann method that simulates a channel flow at varying Reynolds number. The dendrites
orientation and shape depend non-trivially on the ratio between advection and diffusion, i.e.
the Peclet number, as well as the Reynolds number. Roughness induced vortices near growing
dendrites at high flow rates further affect the branch splitting of dendrites. We show how the
transport rate in a pipeline may depend on the different dendritic morphologies, and
provide estimates for the flow conditions that correspond to most efficient transport
regimes. |
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