  This work marks the third in a series of experiments that were in a
semi-circular, gas-fluidized bed with side jets. In this work, the particles
are 1 mm ceramic beads. The bed is operated just at and slightly above and
below the minimum fluidization velocity and additional fluidization is provided
by two high-speed gas located on the sides of the bed near the flat, front face
of the unit. Two primary measurements are taken: high-speed video recording of
the front of the bed and bed pressure drop from a tap in the back of the bed.
PIV is used to determine particle motion, characterized as a mean Froude
number, from the high-speed video. A CFD-DEM model of the bed is presented
using the recently released MFIX-Exa code. Four model subvariants are
considered using two methods of representing the jets and two drag models, both
of which are calibrated to exactly match the experimentally measured minimum
fluidization velocity. Although it is more difficult to determine the jet
penetration depths in a straightforward manner as in the previous works using
Froude number contours, the CFD-DEM results compare quite well to the PIV
measurements. Unfortunately, the good agreement of the solids-phase is
overshadowed by significant disagreement in the gas-phase data. Specifically,
the predicted time-averaged standard deviation of the pressure drop is found to
be over an order of magnitude larger than measured. Due to the low value of the
measurements, just 1% of the mean bed pressure drop, it seems possible that the
data is in error. On the other hand, the model may not be accurately capturing
pressure attenuation through an under-fluidized region in the back of the bed.
Without the possibility additional experiments to test the validity of the
data, this work is simply being reported as is without being able to indicate
which, either the simulation or the experiment, is more correct.
