Asymmetric capillary filling of non-Newtonian power law fluids

Authors
Berli, Claudio Luis Alberto; Urteaga, Raul
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
A theoretical analysis of the capillary-driven imbibitions of non-Newtonian fluids in conical capillaries is presented. More precisely, the consequences of the variation in the fluid viscosity with the shear rate are investigated by using the inelastic power law model. Novel fluid dynamic behaviors are predicted, notably the asymmetry of filling times measured from different ends of the conical tube. The effect is due to the anisotropy of the flow domain and takes place with simple Newtonian fluids indeed. It is quantitatively described how shear-thinning fluids increase the asymmetry, and shear-thickening fluids decrease it. Relevant applications in microfluidic rheometry are envisaged. In addition, these results are of interest in active fields of research such as passive micropumping and microflow rectification, where the geometric design of microchannels is the key to control fluidic operations.
Fil: Berli, Claudio Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química (i); Argentina
Fil: Urteaga, Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Física del Litoral; Argentina
Subject
Capillary Filling
Conical Capillaries
Asymmetric filling
Microfluidic rheometry
Física de los Fluidos y Plasma
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/4405