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Bubble pressure requirements to control the bubbling process in forced co-axial air-water jets

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Mecánica de Fluidoses
dc.contributor.authorBolaños Jimenez, Rocio
dc.contributor.authorRuiz-Rus, J.
dc.contributor.authorSevilla Santiago, Alejandro
dc.contributor.authorMartínez Bazan, Jesús Carlos
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.date.accessioned2022-09-13T08:40:38Z
dc.date.available2022-12-01T00:00:05Z
dc.date.issued2020-12-01
dc.description.abstractWe analyse the controlled generation of bubbles of a given size at a determined bubbling rate in a co-flowing water stream forcing the gas flow. The temporal evolution of the bubble size, R(t), the air flow rate, Qa(t), and the pressure evolution inside the bubble, pb(t), during the bubbling process are reported. To that aim, the temporal evolution of the bubble shape and the pressure inside the air feeding chamber, pc(t), where a harmonic perturbation is induced using a loudspeaker, are obtained from high-speed images synchronized with pressure measurements. A model is developed to describe the unsteady motion of the gas stream along the injection needle, coupled with the Rayleigh-Plesset equation for the growing bubble, allowing us to obtain pb(t). Thus, the minimum pressure amplitudes required inside the forming bubble to control their size and bubbling frequency are provided as a function of the gas flow rate, the liquid velocity, uw, and the forcing frequency, ff. Two different behaviors have been observed, depending on the liquid-to-gas velocity ratio, . For small enough values of Λ, the critical pressure amplitude is given by associated to a rapid pressure increase taking place during an interval of time of the order of the acoustic time. However, for larger values of Λ, Here ρ and ρa are the liquid and gas densities respectively, c the speed of sound in air and and the Strouhal and Weber numbers, where ro denotes the outer radius of the injector.en
dc.description.sponsorshipThis work has been supported by the Spanish MINECO and European Funds under projects DPI2017-88201-C3-2-R and DPI2017-88201-C3-3-R. JRR wants to acknowledge the Spanish MINECO for the financial support provided by the Fellowship BES-2015-071329. Support from the Red Nacional para el Desarrollo de la Microfluídica, RED2018102829T, is also acknowledged.en
dc.description.statusPublicadoes
dc.format.extent14
dc.identifier.bibliographicCitationInternational Journal of Multiphase Flow, (2020), v. 133, 103467.en
dc.identifier.doihttps://doi.org/10.1016/j.ijmultiphaseflow.2020.103467
dc.identifier.issn0301-9322
dc.identifier.publicationfirstpage1
dc.identifier.publicationlastpage14
dc.identifier.publicationtitleINTERNATIONAL JOURNAL OF MULTIPHASE FLOWen
dc.identifier.publicationvolume133
dc.identifier.urihttps://hdl.handle.net/10016/35676
dc.identifier.uxxiAR/0000027748
dc.language.isoengen
dc.publisherElsevieren
dc.relation.projectIDGobierno de España. DPI2017-88201-C3-2-Res
dc.relation.projectIDGobierno de España. DPI2017-88201-C3-3-Res
dc.rights© 2020 Elsevier Ltd. All rights reserved.en
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.otherBubble pressureen
dc.titleBubble pressure requirements to control the bubbling process in forced co-axial air-water jetsen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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