Short time dynamics of viscous drop spreading

Abstract

Liquid drops start spreading directly after coming into contact with a solid sub- strate. Although this phenomenon involves a three-phase contact line, the spread- ing motion can be very fast. We experimentally study the initial spreading dy- namics, characterized by the radius of the wetted area, for viscous drops. Using high-speed imaging with synchronized bottom and side views gives access to 6 decades of time resolution. We show that short time spreading does not exhibit a pure power-law growth. Instead, we find a spreading velocity that decreases logarithmically in time, with a dynamics identical to that of coalescing viscous drops. Remarkably, the contact line dissipation and wetting effects turn out to be unimportant during the initial stages of drop spreading.

References in corpus (4)

• Viscous to Inertial Crossover in Liquid Drop Coalescence
• Initial spreading of low-viscosity drops on partially wetting surfaces
• Coalescence in low-viscosity liquids
• Universality in dynamic wetting dominated by contact line friction

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