Tsai H.-WWu W.-FLai C.-L.WEN-FANG WU2021-08-052021-08-0520218941777https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098222394&doi=10.1016%2fj.expthermflusci.2020.110319&partnerID=40&md5=c60fee993181943b93a3e5ae6c0bf004https://scholars.lib.ntu.edu.tw/handle/123456789/576220The process of throwing a small aluminum circular disk toward the water surface to simulate the stone-skipping phenomenon is experimentally observed and analyzed in this paper. Four stages consisting of pre-hitting, hitting, sliding, and aft-sliding stages for a single skipping process are proposed for a thorough analysis and better understanding of the fundamental physical mechanism of the stone-skipping phenomenon. It is found through this study that, if spinning is not allowed, it is hardly possible to generate the stone-skipping phenomenon when the initial inclined angle of throwing is greater than 8°. Moreover, the maximum number of skips is less than that when spinning is allowed. For larger initial inclined angles of throwing, water walking with or without lateral roll are observed, which is quite different from the stone-skipping phenomena usually observed. ? 2020Fluids; Circular disk; Inclined Angle; Physical mechanism; Water surface; Mechanical engineering[SDGs]SDG7journal article10.1016/j.expthermflusci.2020.1103192-s2.0-85098222394