Numerical Simulation of the Dynamics of Water Droplet Impingement on a Wax Surface
Loading...
Authors
Hu, Junling
Jia, Ruoxu
Huang, Xiao
Xiong, Xingguo
Wan, Kai-tak
Issue Date
2015-04
Type
Article
Language
en_US
Keywords
Droplet impingement , Two phase flow , Hydrophobic surface , Phase field method , Contact angle
Alternative Title
Abstract
The impact of droplets on solid surfaces is important for a wide range of engineering applications, such as ink-jet printing, spray cooling of hot surfaces, spray coating and painting, solder-drop deposition, blood spattering for criminal forensics and disease detection, etc. This paper simulated the dynamic process of a water droplet impinging onto a wax substrate in COMSOL, using the Phase Field method for tracking the free surface. The predicted spreading factor and apex height were validated against experimental results, showing good agreement during the dynamic impingement process. The effect of contact angles on the impingement process was also studied. The initial inertia driven spreading process is not affected by the contact angle, but the later spreading process and recoil process are significantly affected by the contact angle. The simulation results can provide a good understanding of the dynamic impingement process and provide insights on how surface wettability can affect the droplet spreading and rebounding process.
Description
Citation
Publisher
ASEE