• Calculation of liquid film mass transfer coefficients
  • Variation of coefficient with mass flow rate
  • Variation of oxygen flow rate to determine power law relationship
  • How flow rates of water and air can affect the mass transfer coefficient


  • Frame made of stainless steel
  • Process flow diagram in front of panel
  • Sump Tank
  • Wetted wall column of borosilicate glass.
  • Deoxygenation/Desorption column of transparent Plexiglas.
  • Variable area flowmeter for water.
  • Variable area flowmeter for air.
  • Pump for deoxygenator/desprption column
  • Pump for absorption column
  • Air compressor
  • 2 oxygen meters
  • 2 measuring sensors of DO (dissolved oxygen)
  • Piping and valves of stainless steel
  • Safety devices and control for protection of system
  • Emergency push button
  • Spares will be supplied for smooth operation for the period of 1 year.
  • The unit will be provided with all required accessories for smooth running, gases with cylinders (where required), calibration kits (if required), installation & after-sale services, maintenance services and operational manuals.

Wetted wall columns have been designed to study the absorption of air oxygen into deoxygenated water prepared with nitrogen. Absorption enthalpy and solubility are low in this system, and saturating the inlet air with water, will eliminate the effect of auto evaporation; absorption occurs isothermally in these conditions.

Wetted wall columns may be used to determine gas/liquid mass transfer coefficients, essential when calculating the design of absorption towers. Such coefficients form the basis of correlations used to develop packed towers.

WWC examines the absorption of oxygen from air into deoxygenated water. This is an example of liquid film controlled absorption. The liquid film mass transfer coefficient can be determined at various mass flow rates of water.

Technical Data

Wetted wall column

  • Height: 900mm
  • Internal diameter: 32mm
  • Material: Borosilicate Glass

 Deoxygenating column

  • Height: 1500mm
  • Internal diameter: 25mm
  • Material: Plexiglas

 Flow meter

  • Range: 20-280 ml/min (water)
  • Range: 500-5000 ml/min (air)


  • Desorption column pump: 20 l/min @ 2m head
  • Absorption column pump: 10 l/min @ 1m head
  • Air compressor: 4m3/h
  • Sump tank capacity: Approx. 45l



  • Range: 0-199.9% Accuracy: ± 0.5%
  • Resolution: 0.1%
  • Temperature compensation: 0-50°C automatic


  • Range: 0-19.9ppm
  • Accuracy: ± 0.2ppm
  • Resolution: 0.1ppm
  • Temperature compensation: 0-50°C automatic


  • Range: -100°C to +200°C
  • Accuracy: ±0.3°C
  • Resolution: 0.1°C