PIV Measurements On The Formation Of The
Flow Field And Aerosol Particle Distribution
In A Turbulent Square Duct Flow
Author(s)
T. Barth, M. Banowski & U. Hampel
Abstract
The formation of the flow field and spatial aerosol particle distribution play an
important role in various industrial applications. Regarding experiments on
aerosol particle transport phenomena in turbulent flows it is of essential interest
to generate a homogeneously mixed air stream. Particle Image Velocimetry
(PIV) measurements have been conducted in order to characterize the turbulent
mixing process in a small-scale gas/aerosol test facility which is designed for the
investigation of deposition and resuspension of nuclear aerosol particles. The
turbulent flow field in a square duct (Red = 8.9k..43k) is seeded with DEHS
droplets in the size range of approximately dPaero = 2 μm. Firstly, the
downstream formation of particle mixing is quantified in terms of the spatial
distribution of the scatter light intensity of the PIV images. It is found that
sufficient mixing of the aerosol particles is accomplished at 8 to 10 hydraulic
diameters downstream of the injection point. Furthermore, the formation of the
flow field is evaluated in terms of the time mean averaged velocity as well as
velocity fluctuations. These values are presented at successive downstream
positions and display the development of the turbulent boundary layer. It is
shown that the near wall turbulent region of the test section nicely follows the
universal slope of a well developed turbulent boundary layer. Nevertheless, the
flow field formation still takes place after 20 hydraulic diameters.
Keywords: aerosol particles, particle image velocimetry, turbulent flow,
quadrant count method.
Keywords
aerosol particles, particle image velocimetry, turbulent flow,
quadrant count method.
Related Book
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