Fluidization
Principles and definitions
Fluidization is defined as the operation in
which the fine solid particles are transformed
into a fluid-like state through contact with a
gas or a liquid.
Fluidization-Definition
Fluidization
Advantages
•An extremely large area of
contact between solid and fluid.
So, high overall rates of heat and
mass transfer.
•Ease of handling of solids when
in the fluidized condition.
•High degree of solids mixing in
gas-fluidized system.
•High rates of heat transfer
between the fluidized solids and
any immersed system.
•Suited to large-scale operations.
Disadvantages
•Some particles are difficult to
fluidize because of i) an excessive
tendency for particles for attrition ,
or ii) an excessive tendency to
agglomeration.
•The process requires high power to
achieve.
•Operation rates are limited to a
relatively narrow range. Too low
fluid velocity leads to bed
settlement. Too high fluid velocity
leads to excessive particle loss.
•The particle size range is normally
limited to 1/4 in down to a few m
Fundamentals
Fluid Bed Definition
Bed behavior as the fluid flow rate increases
