Measurement of the thermal properties of electrically conducting fluids using coated transient hot wires
- National Institute of Standards and Technology, Boulder, CO (United States)
Measurements of fluid thermal properties using the transient hot-wire technique are described. When bare hot wires are used in electrically conducting fluids there are additional measurement uncertainties due to the formation of electric double layers on the surfaces of the wires and the cell wall. If the electrical conductivity of the fluid is large enough there is also significant power generation in the fluid. These measurement uncertainties can be eliminated by electrically insulating the hot wires with a thin film. The use of tantalum hot wires with an anodized layer of tantalum pentoxide is demonstrated with measurements on nonpolar argon and polar 1,1,1,2 tetrafluoroethane (R134a). Although coated tantalum hot wires have been used previously in a transient mode to measure the thermal conductivity of liquids, this work is the first demonstration of the use of coated wires to measure thermal conductivity in the liquid, vapor, and supercritical gas phases.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- OSTI ID:
- 102994
- Report Number(s):
- CONF-9404137-; ON: DE94017694; TRN: 95:003483-0012
- Resource Relation:
- Conference: 12. symposium on energy engineering sciences, Argonne, IL (United States), 27-29 Apr 1994; Other Information: PBD: [1994]; Related Information: Is Part Of Proceedings of the Twelfth Symposium on Energy Engineering Sciences: Fluid/thermal systems and dynamics; PB: 298 p.
- Country of Publication:
- United States
- Language:
- English
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