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dc.contributor.authorBitlloch, Pau
dc.contributor.authorRuiz Martí, Xavier
dc.contributor.authorRamírez de la Piscina Millán, Laureano
dc.contributor.authorCasademunt Viader, Jaume
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationBitlloch, P., Ruiz, X., Ramirez de La Piscina, L., Casademunt, J. Turbulent bubble jets in microgravity : spatial despersion and velocity fluctuation. "Microgravity science and technology", 01 Juny 2015, vol. 27, núm. 3, p. 207-220.
dc.description.abstractA detailed statistical analysis of bubble dispersion in turbulent jets based on data from drop tower experiments is presented here. A stochastic model is also introduced in order to capture these statistics to a large extent, treating bubbles as passive tracers with a local diffusivity given by a k- epsilon description of the turbulence. Bubble-bubble and bubble-flow interactions are neglected. Simple scaling analysis suggests that this approach is justified sufficiently far downstream. It is also found that, although interactions cannot be neglected very close to the inlet, the model predictions for the overall spatial distribution of the bubble ensemble are compatible with data within experimental uncertainty, and within the limited statistics of the experiments. In addition, the velocity fluctuations from the same experiments are analyzed, obtaining the local standard deviation of bubble velocities. We also find good agreement between experimental data and the effective model. Slight deviations between the model predictions and the experimental data are found at the jet margins, concerning the dependence on Reynolds number of jet angle and the relative velocity fluctuations. Consequently, significant bubble-flow interactions seem to be confined at the boundaries of the jets.
dc.format.extent14 p.
dc.subjectÀrees temàtiques de la UPC::Física::Física de fluids
dc.subject.otherTurbulent jet
dc.subject.otherBubble dispersion
dc.subject.otherBubble interactions
dc.subject.otherDrop tower
dc.subject.otherVelocity fluctuations
dc.titleTurbulent bubble jets in microgravity : spatial despersion and velocity fluctuation
dc.contributor.groupUniversitat Politècnica de Catalunya. BIOCOM-SC - Grup de Biologia Computacional i Sistemes Complexos
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorBitlloch, P.; Ruiz, X.; Ramirez de La Piscina, L.; Casademunt, J.
local.citation.publicationNameMicrogravity science and technology

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