UFC 3-280-04
17 DEC 2003
Figure 5-4. Head Loss vs. Surficial Velocity
Figure 5-5. Typical Curve for Fluidization of Granular Media
The point of the curve labeled Vmf is called the point of incipient fluidization, or
more simply, the minimum fluidization velocity. It is the superficial velocity required for
the onset of fluidization and can be determined by the intersection of the fixed bed and
fluidized bed head loss curves. The pressure drop at the point of fluidization can be cal-
culated from the following equation:
h = L(SGm - 1)(1- α )
where
h
= head loss in meters (feet) of water pressure
L
= bed depth in meters (feet)
α
= porosity of expanded bed
5-21
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