Measurement of Thermal Conductivity and Diffusivity of Electrically Conducting and Highly Corrosive Liquids from Small Samples with a Nex Transient Hot-Wire Instrument - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2008

Measurement of Thermal Conductivity and Diffusivity of Electrically Conducting and Highly Corrosive Liquids from Small Samples with a Nex Transient Hot-Wire Instrument

Résumé

The transient hot-wire technique is widely used for measurements of the thermal conductivity and thermal diffusivity of most fluids. However, for some particular liquids like concentrated nitric acid solutions or similar nitric mixtures , the thermal properties of which are important to know for industrial or security applications , this technique had not still been used (except for a complex particular apparatus using a hot-wire embedded in a glass capillary tube for conductivity measurement), essentially on account of a technological incompatibility between measurement probe materials and highly electrically conducting and corrosive liquids ; moreover , the possible highly energetic character (explosive) of these liquids requires minimum volume liquid samples and safety measurement devices and processes. It is the purpose of this paper to report on a new patented instrument, based on a tantalum short hot-wire probe technology, which responds to the precedent requirements and allows safety automatic and quasi simultaneous conductivity and diffusivity measurements of concentrated nitric acid solutions and similar nitric mixtures from liquid samples less than 2 cm3, with uncertainties less than 5% for conductivity and 12% for diffusivity.
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Dates et versions

hal-00290519 , version 1 (25-06-2008)

Identifiants

  • HAL Id : hal-00290519 , version 1

Citer

Amangoua Jean-Jacques Kadjo, J.-P. Maye, J. Saillard, G. Thévenot, J.-P. Garnier, et al.. Measurement of Thermal Conductivity and Diffusivity of Electrically Conducting and Highly Corrosive Liquids from Small Samples with a Nex Transient Hot-Wire Instrument. 5th European Thermal Sciences Conferences, May 2008, Eindhoven, Netherlands. pp.8. ⟨hal-00290519⟩
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