๐ง Falling Film Evaporator & Desalination Sizer
Size falling film evaporators and MED desalination plants: Chun & Seban falling film correlation, minimum wetting rate, vapor generation rate, and steam economy.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Heat Exchangers
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โ ACTIVE
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Released
Jun 2026
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< 1 ms
๐ง Falling Wavy Liquid Film & Steam Condensation Jacket
Real-time visual simulation: Gravity falling liquid film with vapor bubbles and outer condensing steam๐ Configuration & Presets
๐ Seawater MED Desalination
๐ฅ Skim Milk Concentration
๐ชต Black Liquor Evaporator
๐ Sugar Juice Evaporation
Chun & Seban Falling Film Model:
โข Peripheral Wetting: ฮ = แนfeed / (Nt ยท ฯ ยท Di) [kg/(mยทs)]
โข Film Reynolds: Ref = 4 ฮ / ฮผL
โข Minimum Wetting Criteria: ฮmin โฅ 0.04 kg/(mยทs) (Prevents tube dryout & scaling)
โข Evaporation Duty: Qฬ = U ยท A ยท (Tsteam โ Tevap) [kW].
โข Peripheral Wetting: ฮ = แนfeed / (Nt ยท ฯ ยท Di) [kg/(mยทs)]
โข Film Reynolds: Ref = 4 ฮ / ฮผL
โข Minimum Wetting Criteria: ฮmin โฅ 0.04 kg/(mยทs) (Prevents tube dryout & scaling)
โข Evaporation Duty: Qฬ = U ยท A ยท (Tsteam โ Tevap) [kW].
๐ Evaporation Performance Results
Configure inputs and click Compute to view results.
๐ Calculation Methodology & Falling Film Standards
Thin Wavy Liquid Film Evaporation
Falling film evaporators operate with liquid descending as a thin film along the inner wall of vertical tubes under gravity, enabling very high heat transfer coefficients and low residence times.
Minimum Wetting Rate ($\Gamma_{min}$)
Maintaining adequate liquid flow per perimeter prevents dry spots, which cause severe fouling, scaling, and tube burnout.
Key Engineering Assumptions
- Chun & Seban turbulent and laminar falling film correlation.
- Saturated steam condensation on the outer shell side.
- Widely used in multi-effect distillation (MED) seawater desalination, milk powder plants, and black liquor recovery.