Title:
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Capillary filling at the microscale: control of fluid front using geometry
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Author:
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Trejo Soto, Claudia Andrea; Costa Miracle, E.; Rodríguez-Villarreal, Ivón; Cid Vidal, Joan; Alarcón Cor, Tomás; Hernández Machado, Aurora
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Other authors:
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Universitat de Barcelona |
Abstract:
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We propose an experimental and theoretical framework for the study of capillary filling at the micro-scale. Our methodology enables us to control the fluid flow regime so that we can characterise properties of Newtonian fluids such as their viscosity. In particular, we study a viscous, non-inertial, non-Washburn regime in which the position of the fluid front increases linearly with time for the whole duration of the experiment. The operating shear-rate range of our apparatus extends over nearly two orders of magnitude. Further, we analyse the advancement of a fluid front within a microcapillary in a system of two immiscible Newtonian liquids. We observe a non-Washburn regime in which the front can accelerate or decelerate depending on the viscosity contrast between the two liquids. We then propose a theoretical model which enables us to study and explain both non-Washburn regimes. Furthermore, our theoretical model allows us to put forward ways to control the emergence of these regimes by means of geometrical parameters of the experimental set-up. Our methodology allows us to design and calibrate a micro-viscosimetre which works at constant pressure. |
Subject(s):
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-Viscositat -Glicols -Fluids -Plasma sanguini -Viscosity -Glycols -Fluids -Blood plasma |
Rights:
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cc-by (c) Trejo Soto, Claudia Andrea et al., 2016
http://creativecommons.org/licenses/by/3.0/es |
Document type:
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Article Article - Published version |
Published by:
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Public Library of Science (PLoS)
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