LrgpV1, Main, Curation, bibRecord, 000278

Hydrodynamics and velocity measurements in gas-liquid swirling flows in cylindrical cyclones

Identifieur interne : 000278 ( Main/Curation ); précédent : 000277; suivant : 000279

Hydrodynamics and velocity measurements in gas-liquid swirling flows in cylindrical cyclones

Auteurs : Rainier Hreiz [France] ; Caroline Gentric [France] ; Noël Midoux [France] ; Richard Laine [France] ; Denis Fuenfschilling [France]

Source :

Chemical Engineering Research and Design [ 0263-8762 ] ; 2014-11.

RBID : Hal:hal-01274044

Abstract

The gas-liquid swirl flow in a gas-liquid cylindrical cyclone separator has been characterized first qualitatively by flow visualizations. The emerged findings were then confirmed quantitatively by Laser Doppler Velocimetry measurements. The vortex core presents a very complex hydrodynamics, characterized by an alternation between a laminar and a turbulent state. The laminar regime is associated with velocities pointing in the same direction as the mean flow, while the turbulent state induces velocities in the opposite direction, i.e. a flow reversal. These observations give a first understanding of the origin of the double flow reversal regime that is encountered in swirl flows. It is shown that this flow structure appears for high swirl intensities, and results from a frequent laminarization of the vortex core. Results show that, contrary to the commonly assumed hypothesis, this flow structure is associated with good separation performance of the cyclone. Accordingly, we propose the use of multiple tangential inlets to generate the swirl motion in the cyclone, which is supposed to favor the double flow reversal regime, and thus, improve the separation efficiency.

Url:

https://hal.univ-lorraine.fr/hal-01274044

DOI: 10.1016/j.cherd.2014.02.029

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Le document en format XML

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<orgName type="university">Université de Lorraine</orgName>
<orgName type="institution">Centre national de la recherche scientifique</orgName>
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<author><name sortKey="Laine, Richard" sort="Laine, Richard" uniqKey="Laine R" first="Richard" last="Laine">Richard Laine</name>
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<orgName>Laboratoire Réactions et Génie des Procédés</orgName>
<orgName type="acronym">LRGP</orgName>
<date type="start">2013-01-01</date>
<desc><address><addrLine>Université de Lorraine - ENSIC, 1 rue de Grandville BP 20451, 54001 Nancy Cedex</addrLine>
<country key="FR"></country>
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<orgName>Université de Lorraine</orgName>
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<date type="start">2012-01-01</date>
<desc><address><addrLine>34 cours Léopold - CS 25233 - 54052 Nancy cedex</addrLine>
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<ref type="url">http://www.univ-lorraine.fr/</ref>
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<orgName>Centre National de la Recherche Scientifique</orgName>
<orgName type="acronym">CNRS</orgName>
<date type="start">1939-10-19</date>
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<country>France</country>
<placeName><settlement type="city">Nancy</settlement>
<settlement type="city">Metz</settlement>
<region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
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<orgName type="university">Université de Lorraine</orgName>
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<author><name sortKey="Fuenfschilling, Denis" sort="Fuenfschilling, Denis" uniqKey="Fuenfschilling D" first="Denis" last="Fuenfschilling">Denis Fuenfschilling</name>
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<idno type="RNSR">201320573K</idno>
<idno type="IdUnivLorraine">[UL]RQC--</idno>
<orgName>Laboratoire Réactions et Génie des Procédés</orgName>
<orgName type="acronym">LRGP</orgName>
<date type="start">2013-01-01</date>
<desc><address><addrLine>Université de Lorraine - ENSIC, 1 rue de Grandville BP 20451, 54001 Nancy Cedex</addrLine>
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<orgName>Université de Lorraine</orgName>
<orgName type="acronym">UL</orgName>
<date type="start">2012-01-01</date>
<desc><address><addrLine>34 cours Léopold - CS 25233 - 54052 Nancy cedex</addrLine>
<country key="FR"></country>
</address>
<ref type="url">http://www.univ-lorraine.fr/</ref>
</desc>
</org>
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<tutelle name="UMR7274" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno>
<idno type="IdRef">02636817X</idno>
<orgName>Centre National de la Recherche Scientifique</orgName>
<orgName type="acronym">CNRS</orgName>
<date type="start">1939-10-19</date>
<desc><address><country key="FR"></country>
</address>
<ref type="url">http://www.cnrs.fr/</ref>
</desc>
</org>
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</hal:affiliation>
<country>France</country>
<placeName><settlement type="city">Nancy</settlement>
<settlement type="city">Metz</settlement>
<region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
</placeName>
<orgName type="university">Université de Lorraine</orgName>
</affiliation>
</author>
</analytic>
<idno type="DOI">10.1016/j.cherd.2014.02.029</idno>
<series><title level="j">Chemical Engineering Research and Design</title>
<idno type="ISSN">0263-8762</idno>
<imprint><date type="datePub">2014-11</date>
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<front><div type="abstract" xml:lang="en">The gas-liquid swirl flow in a gas-liquid cylindrical cyclone separator has been characterized first qualitatively by flow visualizations. The emerged findings were then confirmed quantitatively by Laser Doppler Velocimetry measurements. The vortex core presents a very complex hydrodynamics, characterized by an alternation between a laminar and a turbulent state. The laminar regime is associated with velocities pointing in the same direction as the mean flow, while the turbulent state induces velocities in the opposite direction, i.e. a flow reversal. These observations give a first understanding of the origin of the double flow reversal regime that is encountered in swirl flows. It is shown that this flow structure appears for high swirl intensities, and results from a frequent laminarization of the vortex core. Results show that, contrary to the commonly assumed hypothesis, this flow structure is associated with good separation performance of the cyclone. Accordingly, we propose the use of multiple tangential inlets to generate the swirl motion in the cyclone, which is supposed to favor the double flow reversal regime, and thus, improve the separation efficiency.</div>
</front>
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Hydrodynamics and velocity measurements in gas-liquid swirling flows in cylindrical cyclones

Hydrodynamics and velocity measurements in gas-liquid swirling flows in cylindrical cyclones

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