Effect of Phase Change and Solute Diffusion on Spreading on a Dissolving Substrate
Walter Villanueva, William J. Boettinger, James A. Warren, Gustav Amberg
Dissolutive wetting is investigated numerically using a diffuse-interface model that incorporates fluid flow, solute diffusion, and phase change. A range of materials parameters are investigated that: 1) permits recovery of the hydrodynamic limit by suppressing the dissolution of the subsrate and 2) evaluates the role of diffusion. The time history of droplet size, droplet concentration, and angles between the interfaces are given. For convection-dominated case the dynamics of spreading agrees with a known hydrodynamic model for spreading of inert fluids. We have found that phase change increases wetting speed, which is due to a condensation that takes place near the triple junction. There is also a strong dependence of the wetting kinetics on the solute diffusivities. Details of composition changes during spreading are also discussed, such as the composition path of the bulk liquid probled at different locations in the drop.
, Boettinger, W.
, Warren, J.
and Amberg, G.
Effect of Phase Change and Solute Diffusion on Spreading on a Dissolving Substrate, ACTA Materialia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902671
(Accessed March 3, 2024)