2019/04/30 by Marise V. Gielen, Riëlle de Ruiter, Robin B. J. Koldeweij +3 · 2 citations
Engineering · Physics and Astronomy · #Drop (telecommunication) #Fluid Dynamics and Heat Transfer #Granular flow and fluidized beds #Liquid metal #Liquid phase #Metal #Mixing (physics) #Nanomaterials and Printing Technologies #physics.flu-dyn
paper · pdf · doi:10.1017/jfm.2019.886
arxiv created 2019/10/14 · openalex publication_date 2019/11/26 · openalex created_date 2019/12/05 · arxiv updated 2020/01/08 · openalex updated_date 2026/08/05
Hot liquid metal drops impacting onto a cold substrate solidify during their subsequent spreading. Here we experimentally study the influence of solidification on the outcome of an impact event. Liquid tin drops are impacted onto sapphire substrates of varying temperature. The impact is visualised both from the side and from below, which provides a unique view on the solidification process. During spreading an intriguing pattern of radial ligaments rapidly solidifies from the centre of the drop. This pattern determines the late-time morphology of the splat. A quantitative analysis of the drop spreading and ligament formation is supported by scaling arguments. Finally, a phase diagram for drop bouncing, deposition and splashing as a function of substrate temperature and impact velocity is provided.