Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical study of slot coating flows with a viscous liquid-gas interface
Submission Author:
Filipe Oliveira da Silva , RJ , Brazil
Co-Authors:
Filipe Oliveira da Silva, Ivan Siqueira, Marcio CARVALHO, Roney Thompson
Presenter: Filipe Oliveira da Silva
doi://10.26678/ABCM.COBEM2023.COB2023-2027
Abstract
Slot coating is a widely used and highly precise manufacturing method that applies a thin liquid film onto a solid surface, also known as the substrate, at a constant velocity. We employ the equations of motion for incompressible Newtonian liquids in bulk flow coupled with the Boussinesq-Scriven constitutive equation for viscous interfaces in the dynamic boundary condition at the liquid-air free surface. The problem is then solved using Finite Element Method with elliptic mesh generation and Galerkin’s weighted residuals. We conduct a parametric study of slot coating flows with a viscous liquid-gas interface in order to determine the viscous interface influence for different Capillary and Boussinesq numbers at different flow rates. The results reveal that when the interfacial viscosity increases, the meniscus curvature reduces regardless of capillary number, i.e., surface tension. As the free surface bends less, it also requires more substrate length for the film to achieve rigid-body movement, thus influencing the streamwise velocity and the liquid acceleration along the free surface.
Keywords
Slot coating, Boussinesq-Scriven model, Interfacial rheology, Finite Element Method, Viscous Interfaces
