The Meniscus Depression Of A Porous Spherical
Particle At The Three Phase Contact Line
Author(s)
P. Basařová, D. Horn & A. Capriotti
Abstract
The description of the processes at the three phase contact line is very important
for the study of elementary steps in flotation. When a hydrophobic particle is
attached to a gas-liquid interface, it is influenced by a number of forces,
including surface tension, capillary and buoyancy forces on one hand and the
particle weight on the other. In the case of porous particles, capillary forces
acting in the porous surface must also be considered. The meniscus depression at
the three-phase contact line is determined by the resultant force. The meniscus
depression of the floating particle was studied using the image analysis method.
The depression was studied for spherical polystyrene particles of diameters from
0.5 to 3mm. We compared the experimental values of meniscus depression with
the data calculated using theoretical and semi-empirical models. The theoretical
description of forces acting on the floating spherical porous particle is also given.
We found that the existence of pores and surface inequalities has a significant
influence on particle behaviour on the phase interface.
Keywords: floating particle, meniscus depression, porous surface, capillarity.
1 Introduction
The analysis of forces on the particle attached to the bubble surface has been the
focus of the study of flotation processes since the early days of its industrial
utilization. When a hydrophobic particle is attached to a gas-liquid interface, it is
influenced by a number of forces, including the surface tension and buoyancy
forces on the one hand and the particle weight on the other [1,2]. It is customary
Keywords
floating particle, meniscus depression, porous surface, capillarity.
Related Book
Other papers in this volume
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