๐งช 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.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Mass Transfer
๐ Solver Telemetry
โ ACTIVE
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40
โก Solves
35
๐พ Downloads
259
๐ฆ Fortran Code
6.4 KB
๐
Released
Jun 2026
โฑ๏ธ Latency
< 1 ms
๐งช Vertical Wetted-Wall Tube Falling Film Hydrodynamics & Gas Absorption
Real-time visual simulation of liquid falling film gravity drain, surface velocity & interfacial solute mass transfer๐ Configuration & Presets
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Nusselt & Higbie Formulations:
โข Perimeter Flow: ฮ = (MฬL / Nt) / (ฯ Dt) [kg/(mยทs)]
โข Film Thickness: ฮด = [ 3 ฮผ ฮ / (ฯยฒ g) ]1/3 [mm]
โข Surface Velocity: us = (ฯ g ฮดยฒ) / (2 ฮผ) [m/s]
โข Higbie Coefficient: kL = 2 ยท โ( DAB / (ฯ tc) ) [m/s]
โข Perimeter Flow: ฮ = (MฬL / Nt) / (ฯ Dt) [kg/(mยทs)]
โข Film Thickness: ฮด = [ 3 ฮผ ฮ / (ฯยฒ g) ]1/3 [mm]
โข Surface Velocity: us = (ฯ g ฮดยฒ) / (2 ฮผ) [m/s]
โข Higbie Coefficient: kL = 2 ยท โ( DAB / (ฯ tc) ) [m/s]
๐ Falling Film Performance Results
Configure inputs and click Compute to view results.
๐ 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 $\delta$:
ฮด = [ 3 ฮผ ฮ / (ฯยฒ 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.