Characterization of interface properties of fluids by evaporation of a capillary bridge

Author:

Tadrist Loïc1ORCID,Motte L.2,Rahli O.2,Tadrist Lourès2

Affiliation:

1. Microfluidics Lab, Department of Mechanical and Aerospace Engineering, University of Liege, Allée de la découverte 9, Liège 4000 Belgium

2. CNRS, Institut Universitaire des Systèmes Thermiques et Industriels UMR 7343, Aix-Marseille Université, Marseille 13453 France

Abstract

The surface properties between two non-miscible fluids are key elements to understand mass transfer, chemistry and bio-chemistry at interfaces. In this paper, surface properties are investigated in evaporating and non-evaporating conditions. A capillary bridge between two large plates (similar to a Hele-Shaw cell) is considered. The temporal evolution of surface forces and mass transfers due to evaporation of the liquid are measured. The force depends on surface properties of the substrate. It is adhesive in the wetting case and repulsive in the non-wetting case. The force is also shown to depend linearly on the volume of the capillary bridge FV 0 and inversely to the height of the bridge. Modelling is performed to characterize both surface force and evaporation properties of the capillary bridge. The evaporation is shown to be diffusion driven and is decoupled from the bridge mechanics.

Funder

Fonds De La Recherche Scientifique - FNRS

Publisher

The Royal Society

Subject

Multidisciplinary

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