🧪 Falling Film Absorber (Nusselt & Higbie)
Model vertical wetted-wall falling film tube absorbers, evaluating Nusselt laminar film thickness, surface velocity, Higbie penetration kL, and contact time.
⚡ Fortran 90 Engine
Double Precision (IEEE 754)
✓ ISO / ASME Validated
📊 Solver Telemetry
● ACTIVE
👁️ Consultations
40
⚡ Calculs faits
35
💾 Téléchargements
134
📦 Code Fortran
6.4 KB
📅 Mise en service
Jun 2026
⏱️ Latence
< 1 ms
🧪 Vertical Wetted-Wall Tube Falling Film Hydrodynamics & Gas Absorption
Real-time visual simulation of liquid falling film gravity drain, surface velocity & interfacial solute mass transfer📝 Configuration & Presets
Nusselt & Higbie Formulations:
• Perimeter Flow: Γ = (ṀL / Nt) / (π Dt) [kg/(m·s)]
• Film Thickness: δ = [ 3 μ Γ / (ρ² g) ]1/3 [mm]
• Surface Velocity: us = (ρ g δ²) / (2 μ) [m/s]
• Higbie Coefficient: kL = 2 · √( DAB / (π tc) ) [m/s]
• Perimeter Flow: Γ = (ṀL / Nt) / (π Dt) [kg/(m·s)]
• Film Thickness: δ = [ 3 μ Γ / (ρ² g) ]1/3 [mm]
• Surface Velocity: us = (ρ g δ²) / (2 μ) [m/s]
• Higbie Coefficient: kL = 2 · √( DAB / (π tc) ) [m/s]
📊 Falling Film Performance Results
Configure inputs and click Compute to view results.
📘 Calculation Methodology & Falling Film Standards
Nusselt Laminar Gravity Film
Equating downward gravity body force with wall viscous shear yields the classical parabolic velocity profile across the falling film thickness $\delta$:
δ = [ 3 μ Γ / (ρ² g) ]1/3
Higbie Penetration Theory
For short contact times, solute diffusion penetrates only into the top liquid boundary layer, giving mass transfer coefficient scaling as $k_L \propto \sqrt{D_{AB} / t_c}$.
Key Engineering Assumptions
- Uniform liquid distribution around tube circumference.
- Wetting rate $\Gamma > 0.04\,\text{kg/(m}\cdot\text{s)}$ to prevent film dryout.
- Negligible interfacial shear stress from counter-current or co-current gas.