A study of the splash phenomenon of water drops on wood - Emitted droplet velocity and kinetic energy

The dynamic prompt splash behavior of water drop impinging upon a natural wood surface (Shorea spp.) was studied in this work. The water drop images during the impacting process were taken sequentially to study the properties of the emitted droplets such as the critical Weber number, droplet number, shape, velocity, size, and kinetic energy. For prompt splashing on a Shorea spp. surface, the emitted droplets formed not only during their advancing wetting process but also during the drop receding process. The emitted droplets that formed at the early stage usually had greater velocity but significant deformation. The kinetic energy of the emitted droplets varied with great scattering at every impact height, but the average kinetic energy (KEavg) of the droplets varied linearly with the impact height: KEavg (erg) = 0.0017 (m(0)gH), implying that every emitted droplet had approximately 0.17% of the initial potential energy of the impacting water drop. Furthermore, the number of emitted droplets depended linearly on the Weber number: N = 0304 (We-77). (C) 2017 Elsevier Inc. All rights reserved.