Exploring droplet impact near a millimetre-sized hole: comparing a closed pit with an open-ended pore

Autor: de Jong, Rianne, Enríquez, Oscar R., van der Meer, Devaraj
Rok vydání: 2014
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1017/jfm.2015.220
Popis: We investigate drop impact dynamics near both closed pits and open- ended pores experimentally. The resulting impact phenomena differ greatly for a pit or a pore. For the first, we observe three phenomena: a splash, a jet and an air bubble, whose appearance depends on the distance between impact location and pit. Furthermore, we found that splash velocities can reach up to seven times the impact velocity. Drop impact near a pore, however, results solely in splashing. Surprisingly, two distinct and disconnected splashing regimes occur, with a region of plain spreading in-between. For pores, splashes are less pronounced than in the pit case. We state that, for the pit case, the presence of air inside the pit plays a crucial role: it promotes splashing and allows for air bubbles to appear.
Comment: 17 pages, 11 figures, 1 supplementary movie, submitted to JFM
Databáze: arXiv