The wetting problem of fluids on solid surfaces: Dynamics of lines and contact angle hysteresis

TL;DR

This paper develops a new theoretical framework for understanding the dynamics of contact lines and contact angle hysteresis on solid surfaces, incorporating line viscosity and surface heterogeneities, and matches experimental observations.

Contribution

It introduces a new Young-Dupré equation for dynamic contact angles and derives a macroscopic law for contact-line motion considering surface heterogeneities.

Findings

Theoretical predictions align with contact angle hysteresis phenomena.

Derived a maximum speed limit for wetting and dewetting processes.

Quantitative explanation of dynamic contact angle dependence on contact-line speed.

Abstract

In 1805, Young was the first who introduced an expression for contact angle in static, but today, the motion of the contact-line formed at the intersection of two immiscible fluids and a solid is still subject to dispute. By means of the new physical concept of line viscosity, the equations of motions and boundary conditions for fluids in contact on a solid surface together with interface and contact-line are revisited. A new Young-Dupr\'e equation for the dynamic contact angle is deduced. The interfacial energies between fluids and solid take into account the chemical heterogeneities and the solid surface roughness. A scaling analysis of the microscopic law associated with the Young-Dupr\'e dynamic equation allows us to obtain a new macroscopic equation for the motion of the contact-line. Here we show that our theoretical predictions fit perfectly together with the contact angle hysteresis phenomenon and the experimentally well-known results expressing the dependence of the dynamic contact angle on the celerity of the contact-line. We additively get a quantitative explanation for the maximum speed of wetting (and dewetting).