Identification of Flow Regimes in a Flat Gas‐liquid Bubble Column via Wavelet Transform
Identifieur interne : 001662 ( Main/Exploration ); précédent : 001661; suivant : 001663Identification of Flow Regimes in a Flat Gas‐liquid Bubble Column via Wavelet Transform
Auteurs : Eric Olmos [France] ; Caroline Gentric [France] ; Noël Midoux [France]Source :
- The Canadian Journal of Chemical Engineering [ 0008-4034 ] ; 2003-06.
English descriptors
- KwdEn :
- Bubble, Bubble coalescence, Bubble column, Bubble column reactor, Bubble column reactors, Bubble columns, Bubble passages, Bubble plume, Canadian journal, Central bubble plume, Central plume, Centre, Chem, Chemical engineering, Column centre, Distributor effects, Distributor vicinity, Flow regimes, Flow structures, Frequency phenomena, Heterogeneous regime, Homogeneous regime, Horizontal position, Horizontal positions, Intense zone, Laser doppler anemometry, Liquid macrostructures, Liquid velocities, Liquid velocity, Macrostructures, Mother wavelet, Original signal, Partial aeration, Plume, Power spectra, Power spectrum, Powerful tool, Present paper, Pressure fluctuations, Pressure signals, Radially uniform, Regime transitions, Reynolds stress, Reynolds stresses, Signal scale, Spectral analysis, Transition regime, Turbulent structures, Uctuations, Uniform aeration, Vertical component, Vertical velocity, Visual observations, Wavelet, White noise.
- Teeft :
- Bubble, Bubble coalescence, Bubble column, Bubble column reactor, Bubble column reactors, Bubble columns, Bubble passages, Bubble plume, Canadian journal, Central bubble plume, Central plume, Centre, Chem, Chemical engineering, Column centre, Distributor effects, Distributor vicinity, Flow regimes, Flow structures, Frequency phenomena, Heterogeneous regime, Homogeneous regime, Horizontal position, Horizontal positions, Intense zone, Laser doppler anemometry, Liquid macrostructures, Liquid velocities, Liquid velocity, Macrostructures, Mother wavelet, Original signal, Partial aeration, Plume, Power spectra, Power spectrum, Powerful tool, Present paper, Pressure fluctuations, Pressure signals, Radially uniform, Regime transitions, Reynolds stress, Reynolds stresses, Signal scale, Spectral analysis, Transition regime, Turbulent structures, Uctuations, Uniform aeration, Vertical component, Vertical velocity, Visual observations, Wavelet, White noise.
Abstract
A flat bubble column reactor is studied experimentally to increase the understanding of flow regimes and their transitions. To perform this, qualitative observations and global gas hold‐up measurements are used to detect flow regime transitions. Liquid velocities are measured with Laser Doppler Anemometry (LDA). However, as these signals contain a huge amount of information, it is necessary to use signal treatment techniques to analyse them. Wavelet transform was employed in the present paper. The results show that this technique is a powerful tool to (i) describe liquid flow macrostructures, (ii) study gas distributor effects and consequently, (iii) identify flow regimes.
Url:
DOI: 10.1002/cjce.5450810307
Affiliations:
- France
- Grand Est, Lorraine (région)
- Nancy
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine
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type="ISSN">0008-4034</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0008-4034</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bubble</term><term>Bubble coalescence</term><term>Bubble column</term><term>Bubble column reactor</term><term>Bubble column reactors</term><term>Bubble columns</term><term>Bubble passages</term><term>Bubble plume</term><term>Canadian journal</term><term>Central bubble plume</term><term>Central plume</term><term>Centre</term><term>Chem</term><term>Chemical engineering</term><term>Column centre</term><term>Distributor effects</term><term>Distributor vicinity</term><term>Flow regimes</term><term>Flow structures</term><term>Frequency phenomena</term><term>Heterogeneous regime</term><term>Homogeneous regime</term><term>Horizontal position</term><term>Horizontal positions</term><term>Intense zone</term><term>Laser doppler anemometry</term><term>Liquid macrostructures</term><term>Liquid velocities</term><term>Liquid velocity</term><term>Macrostructures</term><term>Mother wavelet</term><term>Original signal</term><term>Partial aeration</term><term>Plume</term><term>Power spectra</term><term>Power spectrum</term><term>Powerful tool</term><term>Present paper</term><term>Pressure fluctuations</term><term>Pressure signals</term><term>Radially uniform</term><term>Regime transitions</term><term>Reynolds stress</term><term>Reynolds stresses</term><term>Signal scale</term><term>Spectral analysis</term><term>Transition regime</term><term>Turbulent structures</term><term>Uctuations</term><term>Uniform aeration</term><term>Vertical component</term><term>Vertical velocity</term><term>Visual observations</term><term>Wavelet</term><term>White noise</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Bubble</term><term>Bubble coalescence</term><term>Bubble column</term><term>Bubble column reactor</term><term>Bubble column reactors</term><term>Bubble columns</term><term>Bubble passages</term><term>Bubble plume</term><term>Canadian journal</term><term>Central bubble plume</term><term>Central plume</term><term>Centre</term><term>Chem</term><term>Chemical engineering</term><term>Column centre</term><term>Distributor effects</term><term>Distributor vicinity</term><term>Flow regimes</term><term>Flow structures</term><term>Frequency phenomena</term><term>Heterogeneous regime</term><term>Homogeneous regime</term><term>Horizontal position</term><term>Horizontal positions</term><term>Intense zone</term><term>Laser doppler anemometry</term><term>Liquid macrostructures</term><term>Liquid velocities</term><term>Liquid velocity</term><term>Macrostructures</term><term>Mother wavelet</term><term>Original signal</term><term>Partial aeration</term><term>Plume</term><term>Power spectra</term><term>Power spectrum</term><term>Powerful tool</term><term>Present paper</term><term>Pressure fluctuations</term><term>Pressure signals</term><term>Radially 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To perform this, qualitative observations and global gas hold‐up measurements are used to detect flow regime transitions. Liquid velocities are measured with Laser Doppler Anemometry (LDA). However, as these signals contain a huge amount of information, it is necessary to use signal treatment techniques to analyse them. Wavelet transform was employed in the present paper. The results show that this technique is a powerful tool to (i) describe liquid flow macrostructures, (ii) study gas distributor effects and consequently, (iii) identify flow regimes.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Nancy</li></settlement><orgName><li>Centre national de la recherche scientifique</li><li>Laboratoire réactions et génie des procédés</li><li>Université de Lorraine</li></orgName></list><tree><country name="France"><noRegion><name sortKey="Olmos, Eric" sort="Olmos, Eric" uniqKey="Olmos E" first="Eric" last="Olmos">Eric Olmos</name></noRegion><name sortKey="Gentric, Caroline" sort="Gentric, Caroline" uniqKey="Gentric C" first="Caroline" last="Gentric">Caroline Gentric</name><name sortKey="Gentric, Caroline" sort="Gentric, Caroline" uniqKey="Gentric C" first="Caroline" last="Gentric">Caroline Gentric</name><name sortKey="Gentric, Caroline" sort="Gentric, Caroline" uniqKey="Gentric C" first="Caroline" last="Gentric">Caroline Gentric</name><name sortKey="Midoux, Noel" sort="Midoux, Noel" uniqKey="Midoux N" first="Noël" last="Midoux">Noël Midoux</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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