๐ช๏ธ Fluidized Bed Hydrodynamics & Minimum Fluidization
Calculate gas-solid fluidized bed hydrodynamics: minimum fluidization velocity (Umf), terminal free-fall velocity (Ut), Archimedes number, Geldart particle classification, and bed pressure drop.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Fluid Mechanics
๐ Solver Telemetry
โ ACTIVE
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38
โก Solves
32
๐พ Downloads
475
๐ฆ Fortran Code
4.5 KB
๐
Released
Jun 2026
โฑ๏ธ Latency
< 1 ms
๐ช๏ธ Gas-Solid Fluidized Bed Hydrodynamics & Bubble Eruption
Real-time visual simulation: Gas distributor grid, particle bed expansion, and rising void bubbles๐ Configuration & Presets
๐ฅ Sand Combustor (Geldart B)
โก FCC Regenerator (Geldart A)
๐ชต Biomass Gasifier (Geldart D)
๐ Pharma Batch Dryer
Wen & Yu / Ergun Fluidization Formulation:
โข Archimedes Number: Ar = dpยณ ยท ฯg ยท (ฯp โ ฯg) ยท g / ฮผgยฒ
โข Minimum Fluidization Reynolds: Remf = โ(33.7ยฒ + 0.0408 Ar) โ 33.7
โข Minimum Fluidization Velocity: Umf = Remf ยท ฮผg / (ฯg ยท dp) [m/s]
โข Bed Pressure Drop: ฮPbed = (1 โ ฮตmf) ยท (ฯp โ ฯg) ยท g ยท Hโ [kPa].
โข Archimedes Number: Ar = dpยณ ยท ฯg ยท (ฯp โ ฯg) ยท g / ฮผgยฒ
โข Minimum Fluidization Reynolds: Remf = โ(33.7ยฒ + 0.0408 Ar) โ 33.7
โข Minimum Fluidization Velocity: Umf = Remf ยท ฮผg / (ฯg ยท dp) [m/s]
โข Bed Pressure Drop: ฮPbed = (1 โ ฮตmf) ยท (ฯp โ ฯg) ยท g ยท Hโ [kPa].
๐ Fluidization Results
Configure inputs and click Compute to view results.
๐ Calculation Methodology & Fluidization Standards
Geldart Particle Groups
Categorizes gas-solid fluidization behavior into 4 groups: Group A (aeratable catalysts), Group B (sand bubbling), Group C (cohesive fine powders), and Group D (coarse spouting grains).
Constant Pressure Drop Principle
Once fluidization begins ($U_0 \ge U_{mf}$), the total pressure drop across the bed remains constant and equals the apparent buoyant weight of the bed per unit area.
Key Engineering Assumptions
- Wen & Yu (1966) correlation for $Re_{mf}$ across broad Archimedes numbers.
- Haider & Levenspiel terminal velocity equation for non-spherical particles.
- Applicable to CFB boilers, FCC regenerators, biomass gasifiers, and drying beds.