Characterization of two-phase flow regimes in horizontal tubes using 81mKr tracer experiments

Abstract : The diagnosis of heat exchangers on duty with respect to flow mal-distributions needs the development of non-intrusive inlet–outlet experimental techniques in order to perform an online fault diagnosis. Tracer experiments are an example of such techniques. They can be applied to mono-phase heat exchangers but also to multi-phase ones. In this case, the tracer experiments are more difficult to perform. In order to check for the capabilities of tracer experiments to be used for the flow maldistribution diagnosis in the case of multi-phase heat exchangers, we present here a preliminary study on the simplest possible system: two-phase flows in a horizontal tube. 81mKr is used as gas tracer and properly collimated NaI (TI) crystal scintillators as detectors. The specific shape of the tracer response allows two-phase flow regimes to be characterized. Signal analysis allows the estimation of the gas phase real average velocity and consequently of the liquid phase real average velocity as well as of the volumetric void fraction. These results are compared successfully to those obtained with liquid phase tracer experiments previously presented by Oriol et al. 2007. Characterization of the two-phase flow regimes and liquid dispersion in horizontal and vertical tubes using coloured tracer and no intrusive optical detector. Chem. Eng. Sci. 63(1), 24–34, as well as to those given by correlations from literature.
Type de document :
Article dans une revue
Applied Radiation and Isotopes, Elsevier, 2008, Vol. 66, pp.1363-1370. 〈10.1016/j.apradiso.2008.03.017〉
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-00316454
Contributeur : Josiane Moras <>
Soumis le : mercredi 3 septembre 2008 - 10:23:41
Dernière modification le : jeudi 7 février 2019 - 16:42:53

Identifiants

Collections

Citation

J. Oriol, J.-P. Leclerc, Ph. Berne, G. Gousseau, C. Jallut, et al.. Characterization of two-phase flow regimes in horizontal tubes using 81mKr tracer experiments. Applied Radiation and Isotopes, Elsevier, 2008, Vol. 66, pp.1363-1370. 〈10.1016/j.apradiso.2008.03.017〉. 〈hal-00316454〉

Partager

Métriques

Consultations de la notice

62