dc.creator | Gordillo Arias de Saavedra, José Manuel | es |
dc.creator | Sevilla, A. | es |
dc.creator | Martínez Bazán, C. | es |
dc.date.accessioned | 2017-04-07T13:56:44Z | |
dc.date.available | 2017-04-07T13:56:44Z | |
dc.date.issued | 2007 | |
dc.identifier.citation | Gordillo Arias de Saavedra, J.M., Sevilla, A. y Martínez Bazán, C. (2007). Bubbling in a co-flow at high Reynolds numbers. Physics of fluids, 19 (7), 077102-1-077102-18. | |
dc.identifier.issn | 1070-6631 | es |
dc.identifier.uri | http://hdl.handle.net/11441/57370 | |
dc.description.abstract | The physical mechanisms underlying bubble formation from a needle in a co-flowing liquid
environment at high Reynolds numbers are studied in detail with the aid of experiments and
boundary-integral numerical simulations. To determine the effect of gas inertia the experiments were
carried out with air and helium. The influence of the injection system is elucidated by performing
experiments using two different facilities, one where the constancy of the gas flow-rate entering the
bubble is ensured, and another one where the gas is injected through a needle directly connected to
a pressurized chamber. In the case of constant flow-rate injection conditions, the bubbling frequency
has been shown to hardly depend on the gas density, with a bubble size given by db / ro
? 6U? K *
U + k2 /? U- 1? 1/3 for U? 2, where U is the gas-to-liquid ratio of the mean velocities, ro is
the radius of the gas injection needle, and
k * = 5,84 and k2 = 4,29, whit db / ro3,3U1 / 3 for U1..
Nevertheless, in this case the effect of gas density is relevant to describe the final instants of bubble
breakup, which take place at a time scale much smaller than the bubbling time, tb. This effect is
evidenced by the liquid jets penetrating the gas bubbles upon their pinch-off. Our measurements
indicate that the velocity of the penetrating jets is considerably larger in air bubbles than in helium
bubbles due to the distinct gas inertia of both situations. However, in the case of constant pressure
supply conditions, the bubble size strongly depends on the density of the gas through the pressure
loss along the gas injection needle. Furthermore, under the operating conditions reported here, the
equivalent diameters of the bubbles are between 10% and 20% larger than their constant flow-rate
counterparts. In addition, the experiments and the numerical results show that, under constant
pressure supply, helium bubbles are approximately 10% larger than air bubbles due to the gas
density effect on the bubbling process. | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | AIP Publishing | es |
dc.relation.ispartof | Physics of fluids, 19 (7), 077102-1-077102-18. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Bubbling | es |
dc.subject | Reynolds numbers | es |
dc.subject | Co-flow | es |
dc.title | Bubbling in a co-flow at high Reynolds numbers | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos | es |
dc.relation.publisherversion | http://aip.scitation.org/doi/abs/10.1063/1.2747996 | es |
dc.identifier.doi | 10.1063/1.2747996 | es |
dc.contributor.group | Universidad de Sevilla. TEP103: Mecánica de Fluidos | es |
idus.format.extent | 18 p. | es |
dc.journaltitle | Physics of fluids | es |
dc.publication.volumen | 19 | es |
dc.publication.issue | 7 | es |
dc.publication.initialPage | 077102-1 | es |
dc.publication.endPage | 077102-18 | es |