• Observation of typical forms of evaporation
    • Single phase liquid flow
    • Bubbly flow
    • Slug flow
    • Annular flow
    • Film boiling
    • Drop flow (mist)
    • Single phase vapour flow
  • Effect on the evaporation process by
    • Flow rate
    • Temperature
    • Pressure


  • Evaporation in a water pipe evaporator
  • Laboratory trolley with strong HDF sheet
  • Evaporation pipe made of double-wall glass, heated with hot water
  • Evaporation in inner pipe, heating in the outer sheath
  • Circulating pump
  • Water jet pump for generating partial vacuum
  • CFC free evaporation liquid

The process of evaporation in heated pipes that occurs in water-tube boilers can be demonstrated. The different phases that appear during evaporation in the pipe can be clearly seen. The double-wall glass evaporation pipe allows the evaporation process to be observed closely. Hot water flows through the outer pipe and evaporates the medium in the inner pipe. The non-toxic liquid used starts to evaporate at 40 to 50°C. Low system pressures can be generated with the built-in water jet pump. The pipe systems are clearly laid out on a metal panel. The hot water circuit consists of an expansion vessel, a circulating pump and heater. An evaporation pipe, vapour collector, water-cooled condenser and return pipe form the evaporation circuit.