Direct numerical simulation of bubble-particle interactions under microgravity conditions
- Paper number
IAC-14,A2,2,8,x22906
- Author
Dr. Tong Qin, Beijing institute of Astronautical Systems Engineering, Beijing, China
- Coauthor
Mr. Yansen Wu, Beijing institute of Astronautical Systems Engineering, Beijing, China
- Coauthor
Ms. Dan Shen, Beijing Institute of Astronautical Systems Engineering, China
- Year
2014
- Abstract
The interaction between a deformable bubble and a rigid particle in viscous liquids under microgravity conditions is studied by direct numerical simulation via an arbitrary-Lagrangian-Eulerian(ALE) method. Due to the microgravity, the bubble will stay as a sphere in the fluid without external forces and its deformation is caused by the moving particle. In this study we assume the flow field is axisymmetric and the motion of the gas inside the bubble is neglected. The particle equations and the Navier-Stokes equations for the fluid are solved in a unified finite element framework. The particle obtains an impact velocity by an external force and the impact velocity is varied over a wide range. A 'critical time scale' $T_0$ was identified for the interaction process. For successful contacts between particle and bubble, the time scale of their relative motion must be less than $T_0$. The film drainage process and the film thickness between the particle and bubble surface are also studied.
- Abstract document
- Manuscript document
IAC-14,A2,2,8,x22906.pdf (🔒 authorized access only).
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