Study of Bowling Water Drop on Water Surface

• Main Authors: LAW KIAT LI, 羅傑禮
• Other Authors: Hong-Yu Chu
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/n75ck4

碩士 === 國立中正大學 === 物理系研究所 === 106 === Water drops fall from water-tap onto water pool, the drops merge with water pool immediately. This phenomenon can usually be observed in our kitchen. Sometimes, if the impact speed of the drop is very small, it has a chance to float on water surface for a while. To extent the floating time, there are variety of methods to keep the air layer between the drop. Leidenfrost and Maragoni effect change the temperature to hold the air layer. The air layer of the bouncing drop is constantly refreshed by the oscillation liquid surface. In our experiment, the temperature of the water is same with room temperature and the pool does not be oscillated. This kind of floating drops not only float on water surface but also slide on water surface. The reason of the sliding drop is not the surface wave which is verified by Fourier Transform profilometry (FTP) and Free-Surface Synthetic Schlieren (FS-SS) measurements. The maximum floating time of the drops are proportional to sliding speed. The behavior of the rotating is observed in a water drop. The rotating drop can make the drop slide, and the sliding drop can make the drop rotate -- the drop is rolling on surface. Surrounding air is affected by the rolling drop. This is observed by using a high speed camera. The quantization result is presented through Particle Image Velocimetry (PIV) analysis.