| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a macroscopic physical model for simulating and analyzing particularly a flow of a fluid such as an ink ejection in a form of overcoming conventional problems. <P>SOLUTION: The microscopic physical model simulates and analyzes the ejection of ink from a piezoelectric printing head. The model handles a slipping contact line problem and introduces a mass conservative finite difference implementation using a level set method. First, a critical angle approach is adopted. A triple point is allowed to move if exceeding a critical angle. Second, a non- slip boundary condition in the neighborhood of the triple point is relaxed and is substituted with a free-slip boundary condition. Third, for enabling the triple point to quickly accelerate in the case where the triple point exceeds the critical angle, an extra surface tension is added as a body force to a governing equation. Fourth, the level set method is adopted for implementing a slipping contact line model. Finally, the above idea is incorporated into a fluid solver based on a higher-order projection method. <P>COPYRIGHT: (C)2004,JPO</p> |
