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WL 373 Heat Conduction in Gases and Liquids
Education / GUNT Hamburg / Thermal Engineering and HVAC / Fundamentals of Thermodynamics /

This experimental unit enables experiments to be performed on steady-state thermal conduction in liquid and gaseous materials. It comprises a cylindrical heat exchanger with a heated inner cylinder made of aluminium and a water-cooled jacket.

  The medium for the experiment is fed through a gap. The gap between the two elements was selected so that the transfer of heat due to convection can be ignored. Due to the low temperatures and the polished surfaces, the radiation portion of the heat transfer is also negligible. Temperature sensors measure the temperature difference.

Learning Objectives / Experiments

- Steady-state heat conduction in gases and liquids
- Determination coefficients of thermal conductivity (e.g. water, oil, air, O2, CO2, steam) at different temperatures


[1] Study of the heat conduction of gases and liquids
[2] Experiments in annular gap formed by 2 concentric cylinders
[3] Experimental media water, oil, air
[4] Radiation portion of heat transfer negligible due to low temperatures and polished surfaces
[5] Adjustable electric heater
[6] Manual valves for flow rate adjustment (cooling water, medium to be investigated)
[7] Measuring amplifier with digital displays for temperature difference and heater power and control elements

Technical Data

Heat exchanger
- effective heat transfer area: 0.15m²
- mean effective diameter: 39.6mm
- gap width: 0.4mm

- max. power consumption 160W

- switch-off: at 95°C

Measuring ranges
- temperature: 0...100°C
- power: 0...600W


Dimensions and Weight
l x w x h: 250 x 400 x 150 mm (experimental unit)
l x w x h: 350 x 130 x 250 mm (measuring amplifier)
Weight: approx. 15 kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Cold water supply required
Scope of Delivery

1 experimental unit

1 measuring amplifier

1 syringe 

1 manual

Order Details
060.37300  WL 373  Heat Conduction in Gases and Liquids