A stereo-imaging technique for the simultaneous measurement of
size and velocity of solid/liquid particles in dispersed two-phase flows is
developed. Particles are illuminated with back light provided by the two
strobe lamps. Double-pulsed strobe flashing is done synchronously with the
framing of the CCD camera to achieve the frame-straddling illumination mode
for the measurement of particle velocities. Silhouetted particle images are
acquired with two black-and-white CCD cameras in stereo configuration. The
particle images are analysed with a specially devised procedure, which can
faithfully detect the perimeters both of spherical and of non-spherical
particle images. The use of stereo imaging permits measurement of all three
velocity components and also resolution of the depth-of-field effect in
particle sizing, the problem that has been a key subject in the development
of accurate particle-sizing techniques based on back lighting. The
technique developed here is capable of sizing 10-500µm particles to
within ±4µm inaccuracy. The validity of the technique is
demonstrated by the measurement of a variety of transparent/opaque and
spherical/non-spherical particles falling down a vertical pipe.
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