2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/20975We use a three-dimensional lattice Boltzmann model to investigate the spreading of mesoscale droplets on homogeneous and heterogeneous surfaces. On a homogeneous substrate the base radius of the droplet grows with time as $t^{0.28}$ for a range of viscosities and surface tensions. The time evolutions collapse onto a single curve as a function of a dimensionless time. On a surface comprising of alternate hydrophobic and hydrophilic stripes the wetting velocity is anisotropic and the equilibrium shape of the droplet reflects the wetting properties of the underlying substrate.10 pages, Lattice Boltzmann workshop in ICCS03 conference, to be published in LNCSSoft Condensed Mattertext