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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">AC electrified jets in a flow-focusing device: Jet length scaling</title><author><name sortKey="Castro Hernandez, Elena" sort="Castro Hernandez, Elena" uniqKey="Castro Hernandez E" first="Elena" last="Castro-Hernández">Elena Castro-Hernández</name><affiliation><nlm:aff id="a1">Área de Mecánica de Fluidos, Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos,<institution>Universidad de Sevilla</institution>, Avenida de los Descubrimientos s/n, 41092 Sevilla,<country>Spain</country></nlm:aff></affiliation></author><author><name sortKey="Garcia Sanchez, Pablo" sort="Garcia Sanchez, Pablo" uniqKey="Garcia Sanchez P" first="Pablo" last="García-Sánchez">Pablo García-Sánchez</name><affiliation><nlm:aff id="a2">Departamento de Electrónica y Electromagnetismo, Facultad de Física,<institution>Universidad de Sevilla</institution>, Avenida de Reina Mercedes s/n, 41012 Sevilla,<country>Spain</country></nlm:aff></affiliation></author><author><name sortKey="Alzaga Gimeno, Javier" sort="Alzaga Gimeno, Javier" uniqKey="Alzaga Gimeno J" first="Javier" last="Alzaga-Gimeno">Javier Alzaga-Gimeno</name><affiliation><nlm:aff id="a1">Área de Mecánica de Fluidos, Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos,<institution>Universidad de Sevilla</institution>, Avenida de los Descubrimientos s/n, 41092 Sevilla,<country>Spain</country></nlm:aff></affiliation></author><author><name sortKey="Tan, Say Hwa" sort="Tan, Say Hwa" uniqKey="Tan S" first="Say Hwa" last="Tan">Say Hwa Tan</name><affiliation><nlm:aff id="a3">Queensland Micro- and Nanotechnology Centre,<institution>Griffith University</institution>, Brisbane QLD 4111,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Baret, Jean Christophe" sort="Baret, Jean Christophe" uniqKey="Baret J" first="Jean-Christophe" last="Baret">Jean-Christophe Baret</name><affiliation><nlm:aff id="a4">CNRS,<institution>Univ. Bordeaux</institution>, CRPP, UPR 8641, Soft Micro Systems, 115 Avenue Schweitzer, 33600 Pessac, France and Max-Planck Institute for Dynamics and Self-Organization, Droplets, Membranes and Interfaces, Am Fassberg 17, DE-37077 Goettingen,<country>Germany</country></nlm:aff></affiliation></author><author><name sortKey="Ramos, Antonio" sort="Ramos, Antonio" uniqKey="Ramos A" first="Antonio" last="Ramos">Antonio Ramos</name><affiliation><nlm:aff id="a2">Departamento de Electrónica y Electromagnetismo, Facultad de Física,<institution>Universidad de Sevilla</institution>, Avenida de Reina Mercedes s/n, 41012 Sevilla,<country>Spain</country></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">27375826</idno><idno type="pmc">4912565</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4912565</idno><idno type="RBID">PMC:4912565</idno><idno type="doi">10.1063/1.4954194</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">000429</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000429</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">AC electrified jets in a flow-focusing device: Jet length scaling</title><author><name sortKey="Castro Hernandez, Elena" sort="Castro Hernandez, Elena" uniqKey="Castro Hernandez E" first="Elena" last="Castro-Hernández">Elena Castro-Hernández</name><affiliation><nlm:aff id="a1">Área de Mecánica de Fluidos, Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos,<institution>Universidad de Sevilla</institution>, Avenida de los Descubrimientos s/n, 41092 Sevilla,<country>Spain</country></nlm:aff></affiliation></author><author><name sortKey="Garcia Sanchez, Pablo" sort="Garcia Sanchez, Pablo" uniqKey="Garcia Sanchez P" first="Pablo" last="García-Sánchez">Pablo García-Sánchez</name><affiliation><nlm:aff id="a2">Departamento de Electrónica y Electromagnetismo, Facultad de Física,<institution>Universidad de Sevilla</institution>, Avenida de Reina Mercedes s/n, 41012 Sevilla,<country>Spain</country></nlm:aff></affiliation></author><author><name sortKey="Alzaga Gimeno, Javier" sort="Alzaga Gimeno, Javier" uniqKey="Alzaga Gimeno J" first="Javier" last="Alzaga-Gimeno">Javier Alzaga-Gimeno</name><affiliation><nlm:aff id="a1">Área de Mecánica de Fluidos, Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos,<institution>Universidad de Sevilla</institution>, Avenida de los Descubrimientos s/n, 41092 Sevilla,<country>Spain</country></nlm:aff></affiliation></author><author><name sortKey="Tan, Say Hwa" sort="Tan, Say Hwa" uniqKey="Tan S" first="Say Hwa" last="Tan">Say Hwa Tan</name><affiliation><nlm:aff id="a3">Queensland Micro- and Nanotechnology Centre,<institution>Griffith University</institution>, Brisbane QLD 4111,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Baret, Jean Christophe" sort="Baret, Jean Christophe" uniqKey="Baret J" first="Jean-Christophe" last="Baret">Jean-Christophe Baret</name><affiliation><nlm:aff id="a4">CNRS,<institution>Univ. Bordeaux</institution>, CRPP, UPR 8641, Soft Micro Systems, 115 Avenue Schweitzer, 33600 Pessac, France and Max-Planck Institute for Dynamics and Self-Organization, Droplets, Membranes and Interfaces, Am Fassberg 17, DE-37077 Goettingen,<country>Germany</country></nlm:aff></affiliation></author><author><name sortKey="Ramos, Antonio" sort="Ramos, Antonio" uniqKey="Ramos A" first="Antonio" last="Ramos">Antonio Ramos</name><affiliation><nlm:aff id="a2">Departamento de Electrónica y Electromagnetismo, Facultad de Física,<institution>Universidad de Sevilla</institution>, Avenida de Reina Mercedes s/n, 41012 Sevilla,<country>Spain</country></nlm:aff></affiliation></author></analytic><series><title level="j">Biomicrofluidics</title><idno type="eISSN">1932-1058</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>We use a microfluidic flow-focusing device with integrated electrodes for controlling the production of water-in-oil drops. In a previous work, we reported that very long jets can be formed upon application of AC fields. We now study in detail the appearance of the long jets as a function of the electrical parameters, i.e., water conductivity, signal frequency, and voltage amplitude. For intermediate frequencies, we find a threshold voltage above which the jet length rapidly increases. Interestingly, this abrupt transition vanishes for high frequencies of the signal and the jet length grows smoothly with voltage. For frequencies below a threshold value, we previously reported a transition from a well-behaved uniform jet to highly unstable liquid structures in which axisymmetry is lost rather abruptly. These liquid filaments eventually break into droplets of different sizes. In this work, we characterize this transition with a diagram as a function of voltage and liquid conductivity. The electrical response of the long jets was studied via a distributed element circuit model. The model allows us to estimate the electric potential at the tip of the jet revealing that, for any combination of the electrical parameters, the breakup of the jet occurs at a critical value of this potential. We show that this voltage is around 550 V for our device geometry and choice of flow rates.</p></div></front></TEI><pmc article-type="other"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Biomicrofluidics</journal-id><journal-id journal-id-type="iso-abbrev">Biomicrofluidics</journal-id><journal-id journal-id-type="coden">BIOMGB</journal-id><journal-title-group><journal-title>Biomicrofluidics</journal-title></journal-title-group><issn pub-type="epub">1932-1058</issn><publisher><publisher-name>AIP Publishing LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">27375826</article-id><article-id pub-id-type="pmc">4912565</article-id><article-id pub-id-type="doi">10.1063/1.4954194</article-id><article-id pub-id-type="publisher-id">1.4954194</article-id><article-id pub-id-type="publisher-id">005696BMF</article-id><article-id pub-id-type="publisher-manuscript">MR15-16154R</article-id><article-categories><subj-group subj-group-type="heading"><subject>SPECIAL TOPIC: INVITED ARTICLES ON MICROFLUIDIC RHEOLOGY (GUEST EDITORS ANKE LINDNER AND PAULO ARRATIA)</subject><subj-group subj-group-type="heading"><subject>Regular Articles</subject></subj-group></subj-group></article-categories><title-group><article-title>AC electrified jets in a flow-focusing device: Jet length scaling</article-title></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0002-9990-1161</contrib-id><name><surname>Castro-Hernández</surname><given-names>Elena</given-names></name><xref ref-type="aff" rid="a1">1</xref><xref ref-type="author-notes" rid="n1">a)</xref></contrib><contrib contrib-type="author"><name><surname>García-Sánchez</surname><given-names>Pablo</given-names></name><xref ref-type="aff" rid="a2">2</xref></contrib><contrib contrib-type="author"><name><surname>Alzaga-Gimeno</surname><given-names>Javier</given-names></name><xref ref-type="aff" rid="a1">1</xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0002-9764-7868</contrib-id><name><surname>Tan</surname><given-names>Say Hwa</given-names></name><xref ref-type="aff" rid="a3">3</xref></contrib><contrib contrib-type="author"><name><surname>Baret</surname><given-names>Jean-Christophe</given-names></name><xref ref-type="aff" rid="a4">4</xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0002-2190-1188</contrib-id><name><surname>Ramos</surname><given-names>Antonio</given-names></name><xref ref-type="aff" rid="a2">2</xref><xref ref-type="author-notes" rid="n2">b)</xref></contrib><aff id="a1"><label>1</label>Área de Mecánica de Fluidos, Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos,<institution>Universidad de Sevilla</institution>, Avenida de los Descubrimientos s/n, 41092 Sevilla,<country>Spain</country></aff><aff id="a2"><label>2</label>Departamento de Electrónica y Electromagnetismo, Facultad de Física,<institution>Universidad de Sevilla</institution>, Avenida de Reina Mercedes s/n, 41012 Sevilla,<country>Spain</country></aff><aff id="a3"><label>3</label>Queensland Micro- and Nanotechnology Centre,<institution>Griffith University</institution>, Brisbane QLD 4111,<country>Australia</country></aff><aff id="a4"><label>4</label>CNRS,<institution>Univ. Bordeaux</institution>, CRPP, UPR 8641, Soft Micro Systems, 115 Avenue Schweitzer, 33600 Pessac, France and Max-Planck Institute for Dynamics and Self-Organization, Droplets, Membranes and Interfaces, Am Fassberg 17, DE-37077 Goettingen,<country>Germany</country></aff></contrib-group><author-notes><fn id="n1"><label>a)</label><p><email>elenacastro@us.es</email></p></fn><fn id="n2"><label>b)</label><p><email>ramos@us.es</email></p></fn></author-notes><pub-date pub-type="epub"><day>15</day><month>6</month><year>2016</year></pub-date><pub-date pub-type="collection"><month>7</month><year>2016</year></pub-date><volume>10</volume><issue>4</issue><elocation-id seq="1">043504</elocation-id><history><date date-type="received"><day>31</day><month>3</month><year>2016</year></date><date date-type="accepted"><day>04</day><month>6</month><year>2016</year></date></history><permissions><copyright-statement>Copyright © 2016 Author(s)</copyright-statement><copyright-year>2016</copyright-year><copyright-holder>Author(s)</copyright-holder><license license-type="licensed-commercial-use"><license-p>Published by AIP Publishing.</license-p></license><license license-type="ccc"><license-p>1932-1058/2016/10(4)/043504/11/<price>$30.00</price></license-p></license></permissions><abstract><p>We use a microfluidic flow-focusing device with integrated electrodes for controlling the production of water-in-oil drops. In a previous work, we reported that very long jets can be formed upon application of AC fields. We now study in detail the appearance of the long jets as a function of the electrical parameters, i.e., water conductivity, signal frequency, and voltage amplitude. For intermediate frequencies, we find a threshold voltage above which the jet length rapidly increases. Interestingly, this abrupt transition vanishes for high frequencies of the signal and the jet length grows smoothly with voltage. For frequencies below a threshold value, we previously reported a transition from a well-behaved uniform jet to highly unstable liquid structures in which axisymmetry is lost rather abruptly. These liquid filaments eventually break into droplets of different sizes. In this work, we characterize this transition with a diagram as a function of voltage and liquid conductivity. The electrical response of the long jets was studied via a distributed element circuit model. The model allows us to estimate the electric potential at the tip of the jet revealing that, for any combination of the electrical parameters, the breakup of the jet occurs at a critical value of this potential. We show that this voltage is around 550 V for our device geometry and choice of flow rates.</p></abstract><funding-group specific-use="FundRef"><award-group><funding-source><named-content content-type="funder_name">French State</named-content></funding-source><award-id award-type="contract">ANR-10-IDEX-03-02</award-id></award-group><award-group><funding-source><named-content content-type="funder_name">Spanish Government Ministry MEC</named-content></funding-source><award-id award-type="contract">FIS 2014-54539-P</award-id></award-group></funding-group><counts><page-count count="11"></page-count></counts><custom-meta-group><custom-meta><meta-name>crossmark</meta-name><meta-value></meta-value></custom-meta></custom-meta-group></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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