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9 lut 2018 · This paper explores the fluid property commonly called surface tension, its effect on droplet shape and contact angle, and the major influences of contact angle behaviour (i.e. surface roughness and surface chemistry).
Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the imbalance in cohesive forces of the surface layer. In the absence of other forces, drops of virtually all liquids would be approximately spherical.
23 lip 2020 · The difference Δσ in surface tension may be due to differences Δc in the composition of the liquid, where c(x,t) is the concentration field, or due to differences ΔT in the temperature of the...
21 wrz 2020 · The relevant surface tension forces per unit length that pull the droplet in the radial direction are Γ in = γ (s,o)o − γ (s,o)w and Γ out = γ (s,o)a − γ (s,o)o for the inner (droplet ...
Our ultrarapid camera experiments on droplet formation and breakup of different pure liquids therefore provide strong evidence for the existence of a high dynamic surface tension for water and various aqueous solutions on an approximately millisecond time scale.
On page 633 of this issue, Daniel et al. report on the remarkably fast movement of liquid drops on a surface with a radial temperature gradient that generates a surface tension-driven fluid motion, also known as Marangoni flow. They achieve this high-speed droplet movement through a clever manipulation of the forces acting on the droplet.
Surface tension, often represented by \ ( \sigma \) or \ ( \gamma \), is a property of liquids arising from an imbalance in molecular cohesive forces at the surface of the liquid (see Fig. 1).
