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WL 210 Flow Boiling Demonstration
Education / GUNT Hamburg / Thermal Engineering and HVAC / Fundamentals of Thermodynamics /

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. 


Learning Objectives / Experiments

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


[1] Evaporation in a water pipe evaporator
[2] Laboratory trolley with strong metal sheet

[3] Evaporation pipe made of double-wall glass, heated with hot water

[4] Evaporation in inner pipe, heating in the outer sheath
[5] Circulating pump

[6] Water jet pump for generating partial vacuum
[7] CFC free evaporation liquid Solkatherm SES36


Technical Data


- power rating: 2kW

- temperature range: 5...80°C

- max. flow rate: 1.9m³/h

- max. head: 1.5m

- power consumption: 58W
Water jet pump

- required water pressure: 0.5bar

- flow rate: 4...12L/min

- final pressure: 16mbar
Tube evaporator

- length: 1200mm

- inner diameter: 13.6mm

- outer diameter: 24mm
Liquid for evaporation, SES36

- quantity: 0.5L
- pressure range: -1.0...1.5bar relative
Condenser: copper coil


Measuring ranges

- pressure: -1...1.5bar relative

- temperature: 0...100°C


Dimensions and Weight
l x w x h: 1010 x 600 x 1910 mm
Weight: approx. 60 kg
Required for Operation
230V, 50/60Hz, 1 phase, 120V, 60Hz, 1 phase or 120V, CSA, 1 phase
Cooling water: 0.5bar,  minimum 180L/h
Scope of Delivery

1 trainer

1 manual

Order Details
060.21000  WL 210  Flow Boiling Demonstration