Spreading Characteristics of liquids

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Abstract
We encounter the spreading phenomenon in the fusing of powder images in Electrophotographic Imaging. This paper presents a model for droplet spread on a substrate based on Frenkel’s theory. The model yields a set of master curves for spreading characteristics of the droplet. The curves describe the contact angle θ between the boundaries of droplet and the substrate as a function of the normalized time. This normalized time is a function of surface tension and viscosity of the liquid and the size of the droplet. The other variable is the equilibrium contact angle between the liquid and substrate. Experiments were carried out to check the validity of this model for a spreading droplet. Both experimental observations and the model verify the functional relationship, θ = f (normalized time, equilibrium contact angle).

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