Laser stripe measurements of near-wall solid fraction in channel flows of liquid-granular mixtures
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Auteurs : Benoit Spinewine [Belgique] ; Hervé Capart [Taïwan] ; Luigi Fraccarollo [Italie] ; Michele Larcher [Italie]Source :
- Experiments in fluids [ 0723-4864 ] ; 2011.
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Abstract
A simple, robust, and accurate imaging technique is proposed to measure granular concentration profiles in channel flows of liquid-granular mixtures. We focus on moderate to high granular concentrations (5-50%), for which optical access is restricted to regions close to a transparent wall. To measure concentrations in this range, we illuminate solid grains moving near the wall using a transverse laser light sheet. The evolving shape of the laser stripe, deformed by passing grains, is then monitored using an oblique camera. Statistics of the granular distance to wall can thus be acquired and converted to volumetric solid fraction measurements. The method is verified using fluidization cell tests and applied to open-channel sheet flow experiments. Free of any parameter adjustment, the laser stripe method is found to yield good results, and allows joint measurements of granular velocity and solid fraction profiles.
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University</s1><s2>Taipei</s2><s3>TWN</s3><sZ>2 aut.</sZ></inist:fA14><country>Taïwan</country><wicri:noRegion>Taipei</wicri:noRegion></affiliation></author><author><name sortKey="Fraccarollo, Luigi" sort="Fraccarollo, Luigi" uniqKey="Fraccarollo L" first="Luigi" last="Fraccarollo">Luigi Fraccarollo</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Civil and Environmental Engineering and CUDAM, University of Trento</s1><s2>Trento</s2><s3>ITA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>Trento</wicri:noRegion></affiliation></author><author><name sortKey="Larcher, Michele" sort="Larcher, Michele" uniqKey="Larcher M" first="Michele" last="Larcher">Michele Larcher</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Civil and Environmental Engineering and CUDAM, University of Trento</s1><s2>Trento</s2><s3>ITA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>Trento</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Experiments in fluids</title><title level="j" type="abbreviated">Exp. fluids</title><idno type="ISSN">0723-4864</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Experiments in fluids</title><title level="j" type="abbreviated">Exp. fluids</title><idno type="ISSN">0723-4864</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Binary mixtures</term><term>Concentration distribution</term><term>Experimental study</term><term>Fluidization</term><term>Granular materials</term><term>Liquid solid flow</term><term>Measurement by laser beam</term><term>Open channel flow</term><term>Pipe flow</term><term>Two-phase flow</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Ecoulement conduite</term><term>Ecoulement diphasique</term><term>Ecoulement liquide solide</term><term>Distribution concentration</term><term>Matériau granulaire</term><term>Etude expérimentale</term><term>Mesure par faisceau laser</term><term>Mélange binaire</term><term>Ecoulement canal découvert</term><term>Fluidisation</term><term>4755K</term><term>8380F</term><term>4262E</term><term>4780</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A simple, robust, and accurate imaging technique is proposed to measure granular concentration profiles in channel flows of liquid-granular mixtures. We focus on moderate to high granular concentrations (5-50%), for which optical access is restricted to regions close to a transparent wall. To measure concentrations in this range, we illuminate solid grains moving near the wall using a transverse laser light sheet. The evolving shape of the laser stripe, deformed by passing grains, is then monitored using an oblique camera. Statistics of the granular distance to wall can thus be acquired and converted to volumetric solid fraction measurements. The method is verified using fluidization cell tests and applied to open-channel sheet flow experiments. Free of any parameter adjustment, the laser stripe method is found to yield good results, and allows joint measurements of granular velocity and solid fraction profiles.</div></front></TEI><affiliations><list><country><li>Belgique</li><li>Italie</li><li>Taïwan</li></country><region><li>Vienne (Autriche)</li></region><settlement><li>Vienne (Autriche)</li></settlement><orgName><li>Université catholique de Louvain</li></orgName></list><tree><country name="Belgique"><region name="Vienne (Autriche)"><name sortKey="Spinewine, Benoit" sort="Spinewine, Benoit" uniqKey="Spinewine B" first="Benoit" last="Spinewine">Benoit Spinewine</name></region></country><country name="Taïwan"><noRegion><name sortKey="Capart, Herve" sort="Capart, Herve" uniqKey="Capart H" first="Hervé" last="Capart">Hervé Capart</name></noRegion></country><country name="Italie"><noRegion><name sortKey="Fraccarollo, Luigi" sort="Fraccarollo, Luigi" uniqKey="Fraccarollo L" first="Luigi" last="Fraccarollo">Luigi Fraccarollo</name></noRegion><name sortKey="Larcher, Michele" sort="Larcher, Michele" uniqKey="Larcher M" first="Michele" last="Larcher">Michele Larcher</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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