Manotosh Baidya
Department of Mechanical Engineering, IIT Madras
Imdad Uddin Chowdhury
Department of Mechanical Engineering, IIT Madras
Pallab Sinha Mahapatra
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India
Droplet spreading on a surface is a natural phenomenon and
found enormous applications in electronic chip cooling, lab on a chip, inject printing, spray cooling to name a few. Most of the numerical work of the droplet impingement phenomena have been studied in the literature for isotropic surface wettability condition where contact angle is uniform for the whole solid surface. We focus on the droplet impingement phenomena for anisotropic surface wettability condition, where a solid surface has different contact angles in different locations. Droplet spreading depends on the Weber number (We), Reynolds number (Re), and the surface
properties. The low wetting surface has a high tendency to
repeal the liquid, whereas more wettable surface tends to attract the liquid. By wettability patterning the solid surface, we can control the droplet spreading after the drop impact on the surface.