Heat conduction in fluids
WL 422
Function
The measurement of heat conduction in fluids is very demanding due to the relatively poor conductivity and associated low heat fluxes.
Two cylinders form the main component of the experimental unit: an electrically heated inner cylinder situated in a water-cooled outer cylinder.
There is a concentric annular gap between the two cylinders. This annular gap is filled with the fluid being studied. The heat conduction occurs from the inner cylinder, through the fluid to the outer cylinder.
The narrow annular gap prevents the formation of a convective heat flux and allows a relatively large pass-through area while at the same time providing a homogeneous temperature distribution.
This method allows the thermal conductivity of liquid and gaseous fluids to be investigated.
Accurate measurement
special shaping of the inner cylinder and the water flow in the outer cylinder result in a homogeneous temperature distribution
the special structure of the experimental setup leads to low parasitic heat fluxes and low disturbance variables
Quickly reach the steady state
low masses of inner and outer cylinder allow rapid heating
patented pressure balancing piston allows constant pressure in the fluid when heating
Specifications
investigation of the thermal conductivity of common fluids, e.g. water, oil, air or carbon dioxide
concentric annular gap between 2 cylinders containing the fluid being studied
inner cylinder, continuously electrically heated
water-cooled outer cylinder
display of temperatures and heating power in the software
due to integrated microprocessor-based instrumentation no additional devices with error-prone wiring are required
functions of the GUNT software: system operation, data acquisition, educational software
network capability: LAN/WLAN connection of any number of external workstations with GUNT software for observation and evaluation of the experiments
E-Learning: multi-media didactic materials accessible online
Learning objectives/ experiments
steady heat conduction in gases and liquids:
determine the thermal resistance of fluids
determination of thermal conductivities k for different fluids at different temperatures
transient heat conduction in fluids:
interpret transient states during heating and cooling
introduction to transient heat conduction with the block capacity model
GUNT-E-Learning
multi-media online course, which enables learning independent of time and place
access via Internet browser
educational software including different learning modules
course in the fundamentals
detailed thematic courses
check through targeted review of the learning objectives
authoring system with editor that enables you to integrate your own, local content into the educational software
Features
effect of different fluids on heat conduction
network capability: network access to ongoing experiments by any number of external workstations
GUNT software: operation and control of the experimental unit, data acquisition and educational software
E-Learning: multi-media didactic materials accessible online
Technical data
Heater
heating power: 350W
temperature limitation: 95°C
Heat transfer area: 74,39cm2
Annular gap
height: 0,4mm
average diameter: 29,6mm
Inner cylinder
mass: 0,11kg
specific heat capacity: 890J/kg*K
Measuring ranges
temperature: 2x 0…325°C
heating power: 0…450W
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
UL/CSA optional
Dimensions and weight
LxWxH: 670x350x480mm
Weight: approx. 18kg
Required for operation
cold water connection max. 30°C, min. 1L/h
drain
PC with Windows