A technique is described which enables the detection of the phase (liquid or vapor) in steam-water two-phase flow and the temperature measurement of each phase, using the hot junction of a microthermocouple. The signals are processed with a multichannel analyzer in order to obtain the amplitude histograms of the temperature. Significant results are obtained in pool boiling, forced convection subcooled boiling, and flashing flow of water.
La strioscopie appliquée à l'étude de l'ébuilition et du dégazage The use of strioscopie observation methods in boiling and de-aeration studies PAR M. BÉHAR ET R. SÉMÉRIA, INGÉNIEURS AU SERVICE DES TRANSFERTS THERMIQUES DU CENTRE D'ÉTUDES NUCLÉAIRES DE GRENOBLE La sensibilité des dispositifs strioscopiqu.es en noir ou en couleurs est très élevée dans l'eau non isotherme. La difficulté est donc ici d'isoler le phénomène à observer des phénomènes parasites par un choix judicieux du système optique de la cuve d'observation. On décrit les solutions adoptées, et on donne quelques résultats caractéristiques. Black-and-white and colour strioscopic equipment is highly sensitive in non-isothermal water, and the main difficulty in its use therefore, is to successfully isolate the phenomenon one wishes to observe from stray effects by choosing a suitable optical system and observation tank. The article describes the solutions adopted and gives a few representative results.
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