An empirical correlation, considering the temperature effect but no effects of interparticle forces,
on the particle entrainment rate at the gas exit of the fluidized bed has been proposed on the
basis of the comprehensive experimental data. The entrainment flux is considered to consist of
a constant flux independent of freeboard height and another flux decreasing exponentially with
freeboard height. The correlation successfully follows the measured trend where the entrainment
rate increased after an initial decrease with increasing temperature and the minimum
entrainment rate at a given temperature. The correlation also successfully describes the pressure
effect showing that the entrainment rate increases with pressure.
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