Present state of vapour pressure measurements up to 5000 K, and critical point data prediction of uranium oxide
| Autor: | P.R. Kinsman, A. Scotti, R.W. Ohse, J. Magill, C. Cercignani, K.A. Long, J.-F. Babelot |
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| Rok vydání: | 1979 |
| Předmět: |
Nuclear and High Energy Physics
Monatomic gas Chemistry Vapor pressure chemistry.chemical_element Thermodynamics Uranium Laser law.invention Computational physics chemistry.chemical_compound Nuclear Energy and Engineering law Melting point Uranium oxide General Materials Science Spectroscopy Pyrometer |
| Zdroj: | Journal of Nuclear Materials. 80:232-248 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/0022-3115(79)90186-7 |
| Popis: | A new dynamic laser pulse heating technique, allowing thermophysical property measurement and equation of state studies above 3000 K is described. The vapour pressure measurements of uranium oxide up to 5000 K, as required for reactor safety analysis are presented. The present state of experimental work above the melting point is summarised. A complete survey on predicted critical point data of uranium oxides reviewing the various theoretical models is given. The various dynamic pulse heating techniques are outlined. For a study of the high temperature vapours and the gas dynamic expansion phenomena of the gas jet, the laser surface heating equipment has been extended to include high speed diagnostics such as multi-channel spectroscopy, time of flight mass spectrometry, and image converter photography in both the framing and streak recording mode. The evaporation process and thermodynamic interpretation of the data are discussed. A kinetic theory description of the laser induced vapour jet using a monoatomic gas dynamical model is given. The optical absorption in the gas jet, giving an upper temperature limit for the applicability of optical pyrometry has been calculated. The reduction of ionisation potential was found to be of minor importance. |
| Databáze: | OpenAIRE |
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