Publication:
Controlled formation of bubbles in a planar co-flow configuration

dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería de Sistemas Energéticoses
dc.contributor.authorRuiz Rus, J.
dc.contributor.authorBolaños Jimenez, Rocio
dc.contributor.authorGutiérrez Montes, C.
dc.contributor.authorSevilla Santiago, Alejandro
dc.contributor.authorMartínez Bazán, C.
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.date.accessioned2022-09-14T08:15:09Z
dc.date.available2022-09-14T08:15:09Z
dc.date.issued2017-03-01
dc.description.abstractWe present a new method that allows to control the bubble size and formation frequency in a planar air-water co-flow configuration by modulating the Water velocity at the nozzle exit. The forcing process has been experimentally characterized determining the amplitude of the water velocity fluctuations from measurements of the pressure variations in the water stream. The effect of the forcing on the bubbling process has been described by analyzing the pressute signals in the air stream in combinatiOn with visualizations performed with a high-speed camera. We show that, when the forcing amplitude is sufficiently large, the bubbles can be generated at a rate different from the natural bubbling frequency, f(n), which depends on the water-to-air velocity ratio, Lambda u(n)/u(q), and the Weber number, We rho(w)u(n)(2)H(0)/sigma, where 110 is the half-thickness of the air stream at the exit slit, rho(w), the water density and a the surface tension coefficient. Consequently, when the forcing is effective, monodisperse bubbles, of sizes smaller than those generated without stimulation, are produced at the prescribed frequency, f(f) > f(n). The effect of the forcing process on the bubble size is also characterized by measuring the resulting intact length, 1, i.e. the length of the air stem that remains attached to the injector when a bubble is released. In addition, the physics behind the forcing procedure is explained as a purely kinematic mechanism that is added to the effect of the pressure evolution inside the air stream that would take place in the unforced case. Finally, the downstream position of the maximum perturbation amplitude has been determined by a one-dimensional model, exhibiting a good agreement with both experiments and numerical simulations performed with OpenFOAM.en
dc.description.sponsorshipThis work has been supported by the Spanish MINECO (Subdirección General de Gestión de Ayudas a la Investigación), Junta de Andalucía and European Funds, grants Nos. DPI2014-59292-C3-1-P, DPI2014-59292-C3-3-P, P11-TEP7495. Financial support from the University of Jaén, Project No. UJA2013/08/05, is also acknowledged.en
dc.format.extent12
dc.identifier.bibliographicCitationRuiz-Rus, J., Bolaños-Jiménez, R., Gutiérrez-Montes, C., Sevilla, A. & Martínez-Bazán, C. (2017, marzo). Controlled formation of bubbles in a planar co-flow configuration. International Journal of Multiphase Flow, 89, 69-80.en
dc.identifier.doihttps://doi.org/10.1016/j.ijmultiphaseflow.2016.10.008
dc.identifier.issn0301-9322
dc.identifier.publicationfirstpage69
dc.identifier.publicationlastpage80
dc.identifier.publicationtitleInternational Journal of Multiphase Flowen
dc.identifier.publicationvolume89
dc.identifier.urihttps://hdl.handle.net/10016/35686
dc.identifier.uxxiAR/0000019347
dc.language.isoeng
dc.publisherElsevieren
dc.relation.projectIDGobierno de España. DPI2014-59292-C3-1-Pes
dc.relation.projectIDGobierno de España. DPI2014-59292-C3-3-Pes
dc.relation.projectIDGobierno de España. P11-TEP7495es
dc.rights© 2016 Elsevier Ltd. All rights reserveden
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.ecienciaIngeniería Mecánicaes
dc.subject.otherBubble formationen
dc.subject.otherBubbling frequencyen
dc.subject.otherForced breakupen
dc.subject.otherAir-water sheetsen
dc.subject.otherWave distortionen
dc.subject.otherDrop formationen
dc.subject.otherLiquid sheetsen
dc.subject.otherGenerationen
dc.subject.otherJetsen
dc.subject.otherDisintegrationen
dc.subject.otherMicrobubblesen
dc.subject.otherInstabilityen
dc.subject.otherMechanismen
dc.titleControlled formation of bubbles in a planar co-flow configurationen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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