LrgpV1, Main, Exploration, bibRecord, 001143

Characterization of the two-phase flow regimes and liquid dispersion in horizontal and vertical tubes by using coloured tracer and non-intrusive optical detector

Identifieur interne : 001143 ( Main/Exploration ); précédent : 001142; suivant : 001144

Characterization of the two-phase flow regimes and liquid dispersion in horizontal and vertical tubes by using coloured tracer and non-intrusive optical detector

Auteurs : Jean Oriol [France] ; Jean Pierre Leclerc [France] ; Christian Jallut [France] ; Patrice Tochon [France] ; Patrice Clement [France]

Source :

Chemical engineering science [ 0009-2509 ] ; 2008.

RBID : Pascal:08-0012897

Descripteurs français

Pascal (Inist)
- Ecoulement diphasique, Dispersion, Tube vertical, Traceur, Surveillance, Echangeur chaleur, Diagnostic panne, Capteur optique, Phase liquide, Fraction vide, Analyse signal, Corrélation, Analyse corrélation, Nombre Peclet, Ecoulement gaz liquide, Diffusion axiale.

English descriptors

KwdEn :
- Axial mixing, Correlation, Correlation analysis, Dispersion, Fault diagnostic, Gas liquid flow, Heat exchanger, Liquid phase, Optical sensor, Peclet number, Signal analysis, Surveillance, Tracers, Two phase flow, Vertical tube, Void fraction.

Abstract

The monitoring of heat exchangers on duty with respect to flow mal-distributions needs the development of inlet-outlet experimental techniques in order to perform a fault diagnosis. Within this framework and as a first attempt to solve this problem in the case of multi-phase heat exchangers, we propose to use a non-intrusive optical sensor associated to a liquid phase tracer experiment. In order to check the capabilities of this technique, we present here the results that we have obtained for the characterization of two phase flows in horizontal and vertical tubes. The difference between refractive index of the two phases allows estimating the void fraction on the section illuminated by the optical sensor and permits to characterize two-phase flow regime from the signal characteristics. Signal analysis and treatment of the absorbance variation due to the coloured tracer injected in the liquid phase permit to estimate the real liquid phase averaged velocity and consequently the real gas phase average velocity. We also calculated volumetric void fraction and compared it to usual correlations with a good agreement. Finally, the evolution of the experimental liquid phase Peclet number with the two-phase flow regime has been observed and qualitatively explained.

Affiliations:

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Le document en format XML

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<term>Echangeur chaleur</term>
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<term>Capteur optique</term>
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<term>Fraction vide</term>
<term>Analyse signal</term>
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<front><div type="abstract" xml:lang="en">The monitoring of heat exchangers on duty with respect to flow mal-distributions needs the development of inlet-outlet experimental techniques in order to perform a fault diagnosis. Within this framework and as a first attempt to solve this problem in the case of multi-phase heat exchangers, we propose to use a non-intrusive optical sensor associated to a liquid phase tracer experiment. In order to check the capabilities of this technique, we present here the results that we have obtained for the characterization of two phase flows in horizontal and vertical tubes. The difference between refractive index of the two phases allows estimating the void fraction on the section illuminated by the optical sensor and permits to characterize two-phase flow regime from the signal characteristics. Signal analysis and treatment of the absorbance variation due to the coloured tracer injected in the liquid phase permit to estimate the real liquid phase averaged velocity and consequently the real gas phase average velocity. We also calculated volumetric void fraction and compared it to usual correlations with a good agreement. Finally, the evolution of the experimental liquid phase Peclet number with the two-phase flow regime has been observed and qualitatively explained.</div>
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Characterization of the two-phase flow regimes and liquid dispersion in horizontal and vertical tubes by using coloured tracer and non-intrusive optical detector

Characterization of the two-phase flow regimes and liquid dispersion in horizontal and vertical tubes by using coloured tracer and non-intrusive optical detector

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri