In this paper, a combined Eulerain/Lagrangian modelling framework
was provided for the top-spray fluidised bed coating processbased on 2D and 3D discretisation of the bed. The aim of this model
was to describe temperature and humidity distributions as well as
the expanded bed height in the fluidised bed coater. It can be concluded
that the overall CFD model could serve as a powerful tool to
describe the thermodynamics circumstances resulting from heat
and mass transfer in the top-spray fluidised bed coating process
with a considerable consistency with the experimental data.
However, regarding the outlet air temperature, discrepancy
between the values from measurement and CFD prediction could
be seen. Consequently, other mechanisms, for instance, droplet
adhesion, heat and mass transfer between wet particles and hot
fluidising air resulting in agglomeration and layered growth, and
temperature-dependency of model parameters are strongly
needed to be taken into account in future study.