LrgpV1, Main, Exploration, bibRecord, 001516

Effect of solids on homogeneous-heterogeneous flow regime transition in bubble columns

Identifieur interne : 001516 ( Main/Exploration ); précédent : 001515; suivant : 001517

Effect of solids on homogeneous-heterogeneous flow regime transition in bubble columns

Auteurs : P. C. Mena [Portugal, République tchèque] ; M. C. Ruzicka [République tchèque] ; F. A. Rocha [Portugal] ; J. A. Teixeira [Portugal] ; J. Drahos [République tchèque]

Source :

Chemical engineering science [ 0009-2509 ] ; 2005.

RBID : Pascal:05-0361163

Descripteurs français

Pascal (Inist)
- Régime écoulement, Colonne bulle, Eau distillée, Point critique, Stabilité, Modélisation, Chargement, Bulle, Débit fluide.
Wicri :
- topic : Chargement.

English descriptors

KwdEn :
- Bubble, Bubble column, Critical point, Distilled water, Flow regime, Loading, Modeling, Stability.

Abstract

Experiments were conducted to study the effect of the presence of the solid phase on the homogeneous-heterogeneous flow regime transition in a bubble column 0.14m diameter. Air, distilled water and calcium alginate beads (2.1 mm, 1023 kg/m³) at concentrations c = 0-30% (vol.) were the phases. The basic data were the voidage-gas flow rate dependences. The critical point, where the homogeneous regime loses stability and the transition begins, was evaluated by the drift flux model. The critical values of voidage and gas flow rate were the quantitative measures of the homogeneous regime stability. These were plotted against the solid phase concentration. It was found, that both the voidage and the critical values increased with the solid content at low solid loading, approx. c = 0-3%, and decreased at higher loading, c > 3%. The homogeneous regime was thus first stabilized and then destabilized. To explain this dual effect, possible physical mechanisms of the solid phase influence on the uniform bubble bed were discussed.

Affiliations:

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Le document en format XML

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<author><name sortKey="Mena, P C" sort="Mena, P C" uniqKey="Mena P" first="P. C." last="Mena">P. C. Mena</name>
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<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Institute of Chemical Process Fundamentals, Czech Academy of Sciences, Rozvojova 135</s1>
<s2>16502 Prague</s2>
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<author><name sortKey="Drahos, J" sort="Drahos, J" uniqKey="Drahos J" first="J." last="Drahos">J. Drahos</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Effect of solids on homogeneous-heterogeneous flow regime transition in bubble columns</title>
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<author><name sortKey="Ruzicka, M C" sort="Ruzicka, M C" uniqKey="Ruzicka M" first="M. C." last="Ruzicka">M. C. Ruzicka</name>
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<author><name sortKey="Rocha, F A" sort="Rocha, F A" uniqKey="Rocha F" first="F. A." last="Rocha">F. A. Rocha</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Chemical Engineering, Faculty of Engineering, University of Porto</s1>
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<author><name sortKey="Teixeira, J A" sort="Teixeira, J A" uniqKey="Teixeira J" first="J. A." last="Teixeira">J. A. Teixeira</name>
<affiliation wicri:level="4"><inist:fA14 i1="03"><s1>Centre of Biological Engineering-IBQF, University of Minho</s1>
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<author><name sortKey="Drahos, J" sort="Drahos, J" uniqKey="Drahos J" first="J." last="Drahos">J. Drahos</name>
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<series><title level="j" type="main">Chemical engineering science</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bubble</term>
<term>Bubble column</term>
<term>Critical point</term>
<term>Distilled water</term>
<term>Flow regime</term>
<term>Loading</term>
<term>Modeling</term>
<term>Stability</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Régime écoulement</term>
<term>Colonne bulle</term>
<term>Eau distillée</term>
<term>Point critique</term>
<term>Stabilité</term>
<term>Modélisation</term>
<term>Chargement</term>
<term>Bulle</term>
<term>Débit fluide</term>
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</keywords>
</textClass>
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<front><div type="abstract" xml:lang="en">Experiments were conducted to study the effect of the presence of the solid phase on the homogeneous-heterogeneous flow regime transition in a bubble column 0.14m diameter. Air, distilled water and calcium alginate beads (2.1 mm, 1023 kg/m<sup>3</sup>
) at concentrations c = 0-30% (vol.) were the phases. The basic data were the voidage-gas flow rate dependences. The critical point, where the homogeneous regime loses stability and the transition begins, was evaluated by the drift flux model. The critical values of voidage and gas flow rate were the quantitative measures of the homogeneous regime stability. These were plotted against the solid phase concentration. It was found, that both the voidage and the critical values increased with the solid content at low solid loading, approx. c = 0-3%, and decreased at higher loading, c > 3%. The homogeneous regime was thus first stabilized and then destabilized. To explain this dual effect, possible physical mechanisms of the solid phase influence on the uniform bubble bed were discussed.</div>
</front>
</TEI>
<affiliations><list><country><li>Portugal</li>
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<tree><country name="Portugal"><noRegion><name sortKey="Mena, P C" sort="Mena, P C" uniqKey="Mena P" first="P. C." last="Mena">P. C. Mena</name>
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<name sortKey="Rocha, F A" sort="Rocha, F A" uniqKey="Rocha F" first="F. A." last="Rocha">F. A. Rocha</name>
<name sortKey="Teixeira, J A" sort="Teixeira, J A" uniqKey="Teixeira J" first="J. A." last="Teixeira">J. A. Teixeira</name>
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<name sortKey="Ruzicka, M C" sort="Ruzicka, M C" uniqKey="Ruzicka M" first="M. C." last="Ruzicka">M. C. Ruzicka</name>
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Effect of solids on homogeneous-heterogeneous flow regime transition in bubble columns

Effect of solids on homogeneous-heterogeneous flow regime transition in bubble columns

Source :

Descripteurs français

English descriptors

Abstract

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

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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