The influence of turbulence on the orientation state of a dilute suspension of stiff fibers at high Reynolds number in a planar contraction is investigated. High speed imaging and
LDV techniques are used to quantify fiber orientation distribution
and turbulent characteristics. A nearly homogenous, isotropic grid
generated turbulent flow is introduced at the contraction inlet.
Flow Reynolds number and inlet turbulent characteristics are
varied in order to determine their effects on orientation
distribution. The orientation anisotropy is shown to be accurately
modelled by a Fokker-Planck type equation. Results show that
rotational diffusion is highly influenced by inlet turbulent
characteristics and decays exponentially with convergence ratio.
Furthermore, the effect of turbulent energy production in the
contraction is shown to be negligible. Also, the results show
that the flow Reynolds number has negligible effect on the
development of orientation anisotropy, and the influence of
turbulence on fiber rotation is negligible for $mathrm{Pe_r}>$
10. It was concluded that inertia induced fiber motion played a
negligible role in the experiments.
| Identifer | oai:union.ndltd.org:GATECH/oai:smartech.gatech.edu:1853/6894 |
| Date | 10 April 2005 |
| Creators | Brown, Matthew Lee |
| Publisher | Georgia Institute of Technology |
| Source Sets | Georgia Tech Electronic Thesis and Dissertation Archive |
| Language | en_US |
| Detected Language | English |
| Type | Dissertation |
| Format | 1265365 bytes, application/pdf |
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