Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/24909
Three-dimensional aspects of fluid flows in channels. I. Meniscus and thin film regimes
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
We study the forced displacement of a fluid-fluid interface in a three-dimensional channel formed by two parallel solid plates. Using a lattice-Boltzmann method, we study situations in which a slip velocity arises from diffusion effects near the contact line. The difference between the slip and channel velocities determines whether the interface advances as a meniscus or a thin film of fluid is left adhered to the plates. We find that this effect is controlled by the capillary and Péclet numbers. We estimate the crossover from a meniscus to a thin film and find good agreement with numerical results. The penetration regime is examined in the steady state. We find that the occupation fraction of the advancing finger relative to the channel thickness is controlled by the capillary number and the viscosity contrast between the fluids. For high viscosity contrast, lattice-Boltzmann results agree with previous results. For zero viscosity contrast, we observe remarkably narrow fingers. The shape of the finger is found to be universal.
Matèries (anglès)
Citació
Citació
LEDESMA AGUILAR, Rodrigo andrés, HERNÁNDEZ MACHADO, Aurora, PAGONABARRAGA MORA, Ignacio. Three-dimensional aspects of fluid flows in channels. I. Meniscus and thin film regimes. _Physics of Fluids_. 2007. Vol. 19, núm. 102112-1-102112-10. [consulta: 23 de gener de 2026]. ISSN: 0021-8979. [Disponible a: https://hdl.handle.net/2445/24909]