THE INFLUENCE OF TEMPERATURE ON DISPERSION OF PARTICLES ON LIQUID SURFACES

Year 2019, Volume: 5 Issue: 5, 396 - 404, 22.09.2019

Sathish Gurupatham

https://doi.org/10.18186/thermal.623208

Abstract

It
was shown recently that small particles and powders spontaneously disperse on
liquid surfaces when they come in contact with the interface for the first time
(Figure 2). This happens due to the combined effect of the capillary force,
buoyant weight of the particle and the viscous drag that the particles
experience when they encounter the liquid surface. The particles undergo
oscillations normal to the interface before they come to the equilibrium
position on the interface. These oscillations, in turn, induce a flow on the
interface which disperses the particles radially outward. This phenomenon has a
significant role in the pollination of sea plants such as “Ruppia” in which the
formation of “pollen rafts” is the first step which results from the
spontaneous dispersion of their pollens on the water surface. This work
investigates, experimentally, the influence of temperature of the liquid on
which this dispersion occurs. It was observed that the frequency of
oscillations of the particles decreased with the increase in the temperature of
the liquid. It is because the magnitude of capillary force that the particle
experiences also decreased when the temperature of the liquid increased.

Keywords

Adsorption, Surface Tension, Particle Dispersion Fluid-Liquid Interface, Capillary Force, Viscous Drag

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