For both the fast and turbulent fluidized beds, local measurements were
taken at 11 radial positions and 5 heights along the riser for each
particle system and operating condition. The riser phenomena assessed
here include cluster (namely, local appearance probability, duration,
and frequency) 16,17,20, mass flux (both local flux
and overall flux across the cross-section) 15,21 and
segregation 14,21. The same instruments fabricated by
PSRI were used for characterization. Specifically, the local clusters
were measured using fiber optic probes, which housed two fibers that
converged at the probe tip, while the local mass fluxes were measured
using extraction probes with an inner diameter of 0.017 m and the probe
tip oriented 90° to the probe shaft to capture upward or downward flow.
The samples collected from the extraction probes were sieved to obtain
segregation data.