Fluidized Bed Minimum Fluidization Velocity Calculator

Determine onset fluidization velocity ($U_{mf}$), terminal particle velocity ($U_t$), bed pressure drop, and Geldart particle fluidization regime.

Particle & Gas Fluid Properties

Mean Particle Diameter d_p (µm):

Solid Particle Density ρ_p (kg/m³):

Gas Density ρ_g (kg/m³):

Gas Dynamic Viscosity µ (Pa·s): Air at 20°C: ~1.82e-5 Pa·s

Packed Bed Height L_bed (m):

Bed Voidage at Fluidization ε_mf:

Fluidization Velocities & Pressure Drop

Min Fluidization Vel (U_mf):

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Terminal Settling Vel (U_t):

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Archimedes Number (Ar):

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Operating Fluidization Window:

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Bed Pressure Drop (ΔP_bed):

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Geldart Particle Group:

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Fluidization Regimes & Ergun Mechanics

Fluidization occurs when an upward-flowing gas exerts a drag force equal to the net submerged weight of a solid granular bed. At this critical superficial velocity ($U_{mf}$), solid particles become suspended and the bed displays liquid-like fluid behavior.

Operating Window ($U_{mf} < U_{op} < U_t$)

The operable superficial velocity range is bounded on the low end by $U_{mf}$ (below which the bed is defluidized and packed) and on the high end by the terminal settling velocity $U_t$ (above which particles are violently entrained and carried out of the reactor into cyclone separators).

Fluidized Bed Minimum Fluidization Velocity Calculator

Particle & Gas Fluid Properties

Fluidization Velocities & Pressure Drop

Fluidization Regimes & Ergun Mechanics

Operating Window ($U_{mf} < U_{op} < U_t$)

Frequently Asked Questions