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Products  |  Thermal Engineering and HVAC  |  Fundamentals of Thermodynamics  |  WL 210
WL 210 Flow Boiling Demonstration Show data sheet (pdf file) Print page
Technical Description

  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 50C. 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



* Demonstration of evaporation in heated pipes1

* Double-wall pipe evaporator made of glass1
* Operation with harmless, special low boiling point

Alternative products
WL 220 -- Boiling Heat Transfer Unit

[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...80C

- max. flow rate: 1,9m/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: 1.200mm

- 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...100C


Dimensions and Weight
LxWxH: 1.010x600x1.910mm
Weight: approx. 60kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Cooling water: 0,5bar,  min. 180L/h
Scope of Delivery

1 trainer

1 manual

Order Details
060.21000  WL 210  Flow Boiling Demonstration
© 2005 G.U.N.T. Gerätebau GmbH