Thermal Conductivities

For the determination of thermal conductivity of liquids and compressed liquids or liquefied gases the transient hot wire method is available:

• Transient hot wire for liquids (atmospheric pressure, 223 K to 453 K)
• Transient hot wire in pressure cell (stainless steel, up to 300 bar, 223 K to 523 K)

The applied transient hot wire technique which is fast and reliable for liquid phase measurements. The thermodynamic basis for the transient hot wire method is the ideal model of an infinitely long, vertical line source of heat emitting a constant heat flux q to the fluid and being surrounded by a temperature field (see following figure).

In our laboratory a commercial sensor system was combined with an individually constructed high pressure cell including high pressure pump, pressure sensor and electrical or liquid thermostat.