Snakelike Oscillation

1
Two Types of Turbulent Kinetic Energies
(3/2 ?) OF 530 µm Glass Beads
Fluidization Flow Regime Computations
BATCH
CONTINUOUS
RISERS
q m/kVM21-(r/R)4
Wall Layer Oscillates Visibly
Laminar
Turbulent
Choking
?s0.4
Typical Laminar and Turbulent Granular
Temperatures (Kinetic Energies) in Riser and
Bubbling Beds. Risers Ws 21.4Kg/m2-s, U0
5.1 m/s. Bubbling Beds U0 0.587 m/s.
?s0.14
BUBBLING BEDS
Bubble-like
Cluster
Nano
?s0.03

• For Bubbling
• Umf gt 0.1 random oscillation velocity
• No bubbles for 10 nm particles

Particle
Snake-like Oscillation
Bubbling Bed
Turbulent Fluidization
Pneumatic Transport
Fast Fluidization
Dense Suspension Flow
Nanoparticle Flow
Gelderbloom, Gidaspow Lyczkowski, AIChE J.,
49,845, 2003
Drift flux, ch 3 (Gidaspow, 1994) shows the
existence of dilute dense regions
Tsuo Gidaspow, AIChE J., 36, 885, 1990 Neri
Gidaspow, AIChE J., 46,52, 2000 Gidaspow
Mostofi, AIChE J., 49,831, 2003
Jung Gidaspow, J.Nanoparticle Research, 4, 483,
2002
Sun Gidaspow, Ind. Eng. Chem. Research, 38,787,
1999
Increasing Gas Velocity
Figure 1
Figure 2
Experiment Computation