Dynamic wetting failure in curtain coating by the Volume-of-Fluid method

TL;DR

This study uses advanced numerical simulations to analyze dynamic wetting failure in curtain coating, introducing a Navier boundary condition to improve accuracy and predict failure points.

Contribution

The paper presents a novel numerical approach with a Navier boundary condition for better modeling of dynamic wetting in curtain coating.

Findings

Predicted substrate velocity for wetting failure

Validated model against experimental data

Improved understanding of wetting dynamics

Abstract

In this paper we investigate dynamic wetting in the curtain coating configuration. The two-phase Navier-Stokes equations are solved by a Volume-of-Fluid method on an adaptive Cartesian mesh. We introduce the Navier boundary condition to regularize the solution at the triple point and remove the implicit numerical slip induced by the cell-centered interface advection. We use a constant contact angle to describe the dynamic contact line. The resolution of the governing equations allows us to predict the substrate velocity at which wetting failure occurs. The model predictions are compared with prior computations and experimental observations.