M.Z.A. Anabtawi, A. Rashid, and A. Al-Muftah (Bahrain)
Spouted bed, Force balance model, Darcy's flow, Drag
force, Velocity distribution, Janssen Factor
A mathematical model based on Mamuro and Hattori's
force balance model including the drag force effect on the
particles in the annulus of a spouted bed is proposed.
Results were compared with the models proposed by
Mamuro and Hattori  for Darcy's flow and with the
model of Epstein and Levine  and that of Hattori et al.
 for Non-Darcy flow in the annulus.
Results show that the proposed force balance model
predicts lower value of Ua/Umf as Z/Hm increase, and a
higher value of Ur/Uro which implies more radial cross
flow from the spout to the annulus especially in the lower
part of the bed compared to Mamuro and Hattori model
. The model shows a qualitative agreement with the
model proposed by Hattori et al.  for non-Darcy flow.
The new model was found to be sensitive to Janssen