Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace: http://hdl.handle.net/2445/24909

Three-dimensional aspects of fluid flows in channels. I. Meniscus and thin film regimes
Ledesma Aguilar, Rodrigo Andrés; Hernández Machado, Aurora; Pagonabarraga Mora, Ignacio
Universitat de Barcelona
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.
04-05-2012
Dinàmica de fluids
Pel·lícules fines
Viscositat
Capil·laritat
Fluid dynamics
Thin films
Viscosity
Capillarity
(c) American Institute of Physics, 2007
Artículo
info:eu-repo/semantics/publishedVersion
American Institute of Physics
         

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Ledesma Aguilar, Rodrigo Andrés; Hernández Machado, Aurora; Pagonabarraga Mora, Ignacio
Ledesma Aguilar, Rodrigo Andrés; Hernández Machado, Aurora; Pagonabarraga Mora, Ignacio
Ledesma Aguilar, Rodrigo Andrés; Hernández Machado, Aurora; Pagonabarraga Mora, Ignacio