Fig.3
The geometrical information of the separator and the observing fields
adopted in PIV
3. Stereoscopic PIV
measurement
Particle image velocimetry is a non-intrusive technique for the
measurement of fluid velocity from an interest plane within a flow
field. Double-exposure photography to record the position of seeding
particles illuminated by a thin laser light sheet. The particle images
are subsequently digitized in photographic film and analyzed using
correlation techniques to obtain the velocity field.
Recent advances in PIV have been directed towards obtaining
three-dimensional (3D) measurements of fluid velocity. Stereoscopic PIV
method has been successfully demonstrated to acquire two simultaneous
views along directions that perform with camera viewing angles of ±28º
in present work. The apparent displacements recorded by each camera are
later combined to obtain the correct in-plane displacement and the
out-of-plane displacement. The stereoscopic PIV configuration for
experimental measurements is shown in Fig. 4 and the schematic of
stereo-vision is displayed in Fig. 5. All the specifications of stereo
PIV and measurement details can be referred to Ref.[3].