The Effects of turbulence on metal nanoparticle nucleation in turbulent jets.
2011-08
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The Effects of turbulence on metal nanoparticle nucleation in turbulent jets.
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2011-08
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Thesis or Dissertation
Abstract
The effects of turbulence on nanoparticle nucleation are studied using a combination
of fully resolved and large-scale quantities from direct numerical simulations. A size de-
pendent model for homogeneous nucleation captures the formation of zinc nanoparticles.
Growth of these particles is considered by Brownian coagulation. Three simulations are
performed using a single Reynolds number and vapor mass-fraction. In one simulation
nucleation is computed with fully-resolved data while the remaining two compute nu-
cleation with large-scale filtered data, each at different filter-widths. In all simulations
fluid and scalar quantities are fully resolved. A nodal method captures the resultant
particle field, approximating the general dynamic equation. Comparisons between the
three simulations are made in order to asses the role small-scale turbulent features play
on nucleation. Results show that nucleation occurs primarily along the shear layers.
Unresolved subgrid-scale nucleation acts to both increase and decrease nucleation. The
predominant effect is to decrease nucleation. This leads to an over-prediction of nucle-
ated particles when neglecting the small-scales. The over-prediction is largest in laminar
and transitional flow
regimes and increases with filter width. No significant discrepan-
cies are seen in the size of nucleated particles when using large-scale quantities.
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University of Minnesota M.S. thesis. August 2011. Major; Mechanical engineering. Advisor: Sean C. Garrick. 1 computer file (PDF); vii, 50 pages.
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Fager, Andrew Jamison. (2011). The Effects of turbulence on metal nanoparticle nucleation in turbulent jets.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/116893.
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