  When a droplet impacts a fabric mesh at a sufficiently high impact velocity,
it not only spreads over the fabric but also penetrate its pores. To determine
the influence of this liquid penetration of the fabric on droplet spreading on
thin fabric meshes, we measured the droplet spreading ratio on fabric with and
without an underlying substrate using a high-speed camera. For fabrics without
a substrate, the droplet spreading ratio is reduced as the fabric penetration
by the liquid reduces the droplet volume spreading on top of the fabric. Using
entropic lattice Boltzmann simulations, we find that the lower droplet
spreading ratio on fabrics, both with and without a substrate, is due to an
increase of viscous losses inside the droplet during spreading. Comparing
droplet impact of blood with its Newtonian counterpart, we show that for
spreading on fabrics, just like on smooth surfaces, blood can be approximated
as a Newtonian fluid.
