LrgpV1, Main, Exploration, bibRecord, 001C82

Feedstream jet intermittency phenomenon in a continuous stirred tank reactor

Identifieur interne : 001C82 ( Main/Exploration ); précédent : 001C81; suivant : 001C83

Feedstream jet intermittency phenomenon in a continuous stirred tank reactor

Auteurs : I. Houcine ; E. Plasari ; R. David ; Jacques Villermaux [France]

Source :

Chemical Engineering Journal [ 1385-8947 ] ; 1999.

RBID : ISTEX:7F37BA2802284B7996465B96674A27A552933A84

Descripteurs français

Pascal (Inist)
- Agitation mécanique, Analyse dimensionnelle, Condition opératoire, Effet échelle, Etude expérimentale, Extrapolation, Hydrodynamique, Intermittence, Jet, Mesure par faisceau laser, Mélange turbulent, Mélangeage, Réacteur parfaitement agité, Spectrométrie fluorescence, Visualisation écoulement.
Wicri :
- topic : Turbine.

English descriptors

Abstract

Abstract: A feedstream jet intermittency phenomenon and its onset conditions in a continuous stirred tank reactor are detected for the first time using a laser sheet induced fluorescence visualisation technique. The aim of the present investigation is to determine the operating conditions for which the intermittency phenomenon occurs in stirred tank reactors. The jet intermittency parameters studied are: stirrer type (Rushton and 45° pitched blade turbines, profiled Mixel TTP propeller), stirrer rotational speed, fluid viscosity, feeding rate and the feed point location in the tank. In the case of the Rushton turbine stirred tank reactor, diagrams of intermittency occurrence are reported. These diagrams represent the feeding jet velocity as a function of specific power input or local fluid velocity in the tank. It was not possible to derive from these diagrams any valuable correlation. In order to predict and scale-up the occurrence of intermittency in industrial stirred reactors, dimensionless correlations characterising intermittency occurrence in these devices have been modelled for the three types of stirrers. The dominant variables determining the occurrence of intermittency is the ratio of the jet velocity vJ to the tip velocity vtip.

Url:

https://api.istex.fr/document/7F37BA2802284B7996465B96674A27A552933A84/fulltext/pdf

DOI: 10.1016/S1385-8947(98)00124-7

Affiliations:

Le document en format XML

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<term>Feedstream jets</term>
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<term>Fluorescence spectrometry</term>
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<term>Reactor</term>
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<term>Slight intermittency</term>
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<term>Condition opératoire</term>
<term>Effet échelle</term>
<term>Etude expérimentale</term>
<term>Extrapolation</term>
<term>Hydrodynamique</term>
<term>Intermittence</term>
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<term>Intermittency phenomenon</term>
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<term>Laser sheet</term>
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<term>Present investigation</term>
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<term>Rushton</term>
<term>Rushton turbine</term>
<term>Segregation index</term>
<term>Slight intermittencies</term>
<term>Slight intermittency</term>
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<term>Stirrer reynolds number</term>
<term>Stirrer type</term>
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<term>Tank reactor</term>
<term>Tank reactors</term>
<term>Theoretical analysis</term>
<term>Transition range</term>
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<front><div type="abstract" xml:lang="en">Abstract: A feedstream jet intermittency phenomenon and its onset conditions in a continuous stirred tank reactor are detected for the first time using a laser sheet induced fluorescence visualisation technique. The aim of the present investigation is to determine the operating conditions for which the intermittency phenomenon occurs in stirred tank reactors. The jet intermittency parameters studied are: stirrer type (Rushton and 45° pitched blade turbines, profiled Mixel TTP propeller), stirrer rotational speed, fluid viscosity, feeding rate and the feed point location in the tank. In the case of the Rushton turbine stirred tank reactor, diagrams of intermittency occurrence are reported. These diagrams represent the feeding jet velocity as a function of specific power input or local fluid velocity in the tank. It was not possible to derive from these diagrams any valuable correlation. In order to predict and scale-up the occurrence of intermittency in industrial stirred reactors, dimensionless correlations characterising intermittency occurrence in these devices have been modelled for the three types of stirrers. The dominant variables determining the occurrence of intermittency is the ratio of the jet velocity vJ to the tip velocity vtip.</div>
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Feedstream jet intermittency phenomenon in a continuous stirred tank reactor

Feedstream jet intermittency phenomenon in a continuous stirred tank reactor

Source :

Descripteurs français

English descriptors

Abstract

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

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Pour manipuler ce document sous Unix (Dilib)

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