Fluidization Reading Materials: Perry’s Handbook, Chapter 17 M. Rhodes, An Introduction to Particle Technology, Chapter 5

But why Fluidised bed process? Good Heat and mass transfer , and easy to control

Fluidization

Minimum Fluidization Velocity

Minimum Fluidization Velocity

Slow flow Re < 1

Fluidization Velocity

Some other correlations

1100 70.4

Homogeneous Fluidization There are two important factors: Change the porosity Change the bed height

Single settling velocity = fluidisation velocity not necessary minimum fluidized velocity Single settling velocity

Chapter 2

Bubbling (two-phase) Fluidization

Classification of Powders

Motion of bubbles and solids

Density of the fluid Density of the solids

Hint: Assume = 0.45 but also validate this assumption Limiting bubble (or Maximum bubble size) Hint: Assume = 0.45 but also validate this assumption

Heat Transfer in Fluidized Beds

Fluidized Bed Design