Study of impact of water droplet on moving surfaces

• Main Author: Muhammad Nur Haffidz Abdul Rahman
• Other Authors: Charles Yang Chun
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2021
• Subjects: Engineering::Mechanical engineering::Fluid mechanics
• Online Access: https://hdl.handle.net/10356/150870
• Institution: Nanyang Technological University

This report presents the study of impact of water droplet on moving surfaces. Only a few results have been reported due to the difficulty to conduct experiments through its various application in industries. Some examples of the important applications are aircraft icing as well as inkjet printing. This dynamic process occurs quickly and as such it is impossible to study with the naked eye. With technology evolving throughout the years, the access to a high-speed camera became possible and as such, further detailed investigations on the impact of water droplet could be carried out. Phantom V711, a digital high-speed camera was used to capture the impact process of the water droplet on a moving surface. The camera’s ability of capturing up to a million frames per second as well providing high resolution images allows researchers to further analyze and study the characteristics of water droplet’s behavior upon impacting the surface. In this study, the two main parameters for the experiments are: (1) Impact velocity of water droplet, (2) Surface Velocity. The footage recorded by the high-speed camera would be carefully examined through the usage of an imaging software, ImageJ on a frame-by-frame basis. The relationship of the parameters was studied and analyzed. In addition, a study of the dynamics of water droplet done by previous researchers were also analyzed in separate sections to provide a coherent and comprehensive study on this report. We found that the Impact velocity of water droplet and Surface Velocity have a direct relationship with the Maximum spreading diameter of the water droplet.