Bubble formation regimes in forced co-axial air-water jets

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dc.contributor.author Ruiz Rus, J.
dc.contributor.author Bolaños Jimenez, Rocio
dc.contributor.author Sevilla Santiago, Alejandro
dc.contributor.author Martínez Bazan, Jesús Carlos
dc.date.accessioned 2022-09-15T07:52:06Z
dc.date.available 2022-09-15T07:52:06Z
dc.date.issued 2020-07-01
dc.identifier.bibliographicCitation Ruiz-Rus, J., Bolaños-Jiménez, R., Sevilla, A. & Martínez-Bazán, C. (2020, julio). Bubble formation regimes in forced co-axial air-water jets. International Journal of Multiphase Flow, 128, 103296.
dc.identifier.issn 0301-9322
dc.identifier.uri http://hdl.handle.net/10016/35709
dc.description.abstract We report a detailed experimental characterization of the periodic bubbling regimes that take place in an axisymmetric air-water jet when the inner air stream is forced by periodic modulations of the pressure at the upstream air feeding chamber. When the forcing pressure amplitude is larger than a critical value, the bubble formation process is controlled by the forcing frequency, leading to the formation of nearly monodisperse bubbles whose volume is reduced as the forcing rate increases. We reveal the existence of two different breakup modes, M1 and M2, under effective forcing conditions. The bubble formation in mode M1 resembles the natural bubbling process, featuring an initial radial expansion of an air ligament attached to the injector, whose initial length is smaller than the wavelength of a small interfacial perturbation induced by the oscillating air flow rate. The expansion stage is followed by a ligament collapse stage, which begins with the formation of an incipient neck that propagates downstream while collapsing radially inwards, leading to the pinch-off of a new bubble. These two stages take place faster than in the unforced case due to the air flow modulation induced by the forcing system. The breakup mode M2 takes place with an intact ligament longer than one disturbance wavelength, whereby the interface already presents a local necking region at pinch-off, and leads to the formation of bubbles from the tip of an elongated air filament without an expansion stage.
dc.description.sponsorship This 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
dc.format.extent 14
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2020 Elsevier Ltd.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Bubble formation
dc.subject.other Bubbling regimes
dc.subject.other Bubble shape
dc.title Bubble formation regimes in forced co-axial air-water jets
dc.type article
dc.subject.eciencia Ingeniería Mecánica
dc.identifier.doi https://doi.org/10.1016/j.ijmultiphaseflow.2020.103296
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. DPI2017-88201-C3-2-R
dc.relation.projectID Gobierno deEspaña. DPI2017- 88201-C3-3-R
dc.relation.projectID Gobierno de España. BES-2015-071329
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 14
dc.identifier.publicationtitle International Journal of Multiphase Flow
dc.identifier.publicationvolume 128
dc.identifier.uxxi AR/0000026767
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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