A Multiscale Numerical Model of a Deformable Isothermal Nonwetting Liquid Drop

Smith, M.K., Neitzel, G.P.
The George W. Woodruff School of Mechanical Engineering, Georgia Institue of Technology, Atlanta, GA

A state of permanent, isothermal nonwetting of a solid surface by a normally wetting liquid may be achieved by having the surface move tangentially to a liquid drop that is pressed against it. Surrounding gas is swept into the space between the liquid and solid creating a lubricating film that prevents wetting.

The length scales of the drop and the film are typically three or more orders of magnitude different, making numerical simulation difficult from a resolution standpoint.

The present paper focuses on a hybrid approach employing lubrication theory for the thinnest portions of the gas film and numerical simulation for the liquid and outer gas phases.