🧪 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
⚡ Outils & Rapports :
💾 Télécharger Fortran 90

🧪 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

🧪 HCl Graphite Absorber 💨 Ammonia (NH3) Scrubber 🌱 CO2 Amine Capture ⚗️ SO3 Sulfonation Film
📐 Tube Bundle Geometry
💧 Liquid Physical Properties & Diffusivity
Typical liquids: 1.0e-9 to 4.0e-9 m²/s
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]

📊 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.