(140c) Vertical Force Acting on Large Object Floating in Gas-Fluidized Bed (Direct comparison between numerical simulation and Lagrangian measurement)

In practical applications of
fluidized bed such as gasification, combustion and separation, the size of
solid materials is not uniform and large solids coexist with small solids. The
large size difference induces characteristic motions of solids and
significantly influences the mixing and segregation characteristics of the
beds. However, it is difficult to predict these behaviors accurately and forces
acting on large objects in fluidized bed are not fully understood.

In the present study, vertical forces
acting on a single large object free-moving in gas-fluidized bed are obtained numerically
by using the model proposed by Tsuji et al. (AIChE J., 60(5), pp. 1606-1620, 2014). The results are
compared with the experiments under the same condition. Force measurement is performed
using the Lagrangian
sensor system developed by Harada et al. (Int. J. Multiphase Flow, 37,
pp. 898-905, 2011); forces acting on a free-moving object are directly measured
in the system. The density of large object is smaller than the apparent density
of the bed and the large object is floating near the free surface of the
particle bed as shown in Fig. 1. Calculation results agree well with
experimental results quantitatively.