Abstract
A systematic numerical study of bubble entrapment resulting from the impact of a water drop into a deep water pool with various We and Fr numbers has been conducted in the paper. Possible mechanisms causing the phenomenon of bubble entrapment were discussed in detail with detailed velocity field and the free surface profiles. The results of the simulation indicate that when the impact velocity is low (We = 37.2, Fr = 37.8), drop impact produces a shallow crater and vortex rings present during the collapse of the crater. With the increase of impact velocity (We = 149, Fr = 151.2), bubble entrapment present, which is usually accompanied with the formation of a thin high-rising liquid jet. As the impact velocities go on increasing (We = 595.9, Fr = 604.7), regular bubble entrapment and the thin jet are replaced by a thick low-rising jet. In addition, the results of the velocity filed and the free surface profiles shows that bubble entrapment present only when the capillary wave reaches the crater base before the crater base reverses its direction to upward.
| Original language | English |
|---|---|
| Pages (from-to) | 467-471 |
| Number of pages | 5 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 34 |
| Issue number | 3 |
| State | Published - Mar 2013 |
Keywords
- Bubble entrapment
- Crater
- The capillary waves
- VOF model