Droplet transport in a turbulent wake flow
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Date
2015
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University of New Brunswick
Abstract
The present research describes the study of droplet transport in a high Reynolds
number turbulent flow in the wake of a disk. A dilute two-phase flow was produced
using a liquid atomizer nozzle inserted in the wake flow. The air velocity and droplet
size ranges used in this study produced a range of Stokes number from 5 < Stk <
100. A Phase Doppler Interferometer was used to simultaneously measure the size
and velocity of droplets. Results include mean and fluctuation concentration field,
turbulent flux of concentration, gas phase and droplet velocimetry, and droplet size
spectra.
An important part of the current study was focused on identification of appropriate
statistical processing methods for the temporal and spatial structure of droplets
in a turbulent flows. A close investigating of modeling droplet phase as a point process
was performed and the limitations of these models and their differences with
the experimental data were discussed. Two point statistics of point processes were
reviewed and their relation with the physical phenomena, i.e. clustering, scales of
turbulence scales and and structure were investigated.