Mechanism Study of Surface Waves Control via Tank Wall Modification


Student thesis: Doctoral Thesis

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Awarding Institution
  • Lijun Yang (External person) (External Supervisor)
  • Bin WANG (Supervisor)
  • Zuankai Wang (External person) (External Co-Supervisor)
Award date9 Jun 2023


Surface waves control is a crucial aspect of fluid stability science and an essential technology in sloshing. It has various applications in areas such as rocket longitudinal coupling vibration, satellite attitude control, DNA sensors, micro-material preparation, cell cultivation, surface tension testing, and self-organization of tracer particles. Furthermore, it has a significant impact on other sciences, such as non-equilibrium systems and quantum fluid dynamics. With the advancement of technology and the development of micro-control technology, spacecraft have become increasingly smaller, and NanoSat has gained attention. However, traditional unbounded surface wave research has limitations. Therefore, bounded surface wave research has received widespread attention from researchers.

We focus on wall modification methods to obtain various interface parameters and their distribution. Specifically, it analyzes the impact of interface parameters on the transition threshold of surface wave modes. A series of container walls with various interface parameters are designed and prepared. The relationship between surface waves and interface parameters is analyzed in terms of time and space using surface wave contour analysis and proper orthogonal decomposition methods. Based on the viscous linear stability analysis theory, we establish an initial understanding of the relationship between interface parameters and surface waves transition. It introduces an integral term to construct a physical and mathematical model for the impact of interface parameters on surface waves transition threshold.

Furthermore, we verify the impact of a single interface parameter in the surface wave process through experimental measurement. It reveals the effect of decoupling curvature and contact line viscous force on the transition threshold of surface waves. Moreover, inspired by honeycomb vibration absorber structures and fish scale dissipating patterned structures, we design and prepare a series of honeycomb-like structures with gas chambers on the wall and patterned dissipators with variable adhesion to control the transition threshold of surface waves. Specifically, it adjusts the spring stiffness coefficient of honeycomb-like structures by changing the slot width and depth of the gas chamber to alter the surface waves transition threshold. In addition, it adjusts the pattern parameters to generate and diffuse wall eddies, achieving a transition threshold of surface waves adjustment. Combining a highly hydrophobic surface that generates strong edge waves with a patterned surface, we design and prepare a series of fish scale structure patterned surfaces with different curvature arrangements on the container's side wall. It achieves the adjustment of nonlinear pattern harmonics at the center by adjusting the pattern parameters.

Lastly, using phase-change materials, we design and prepare a series of optically responsive walls to achieve control of the transition threshold of surface waves. It analyzes the relationship between the transition threshold of surface waves, pore density, and stimulus frequency, laying an essential foundation for the development of a more responsive surface wave controller.

In summary, we investigate the boundary-influenced surface waves caused by two degrees of freedom spring oscillator and tangential pressure gradient. The control of surface waves is achieved by fabricating an air film and an adhesion pattern surface. In terms of the utilization of boundary control, it develops optically responsive walls, based on the induction of infrared illumination, to remotely and programmatically manipulate the surface waves. These novel mechanisms lay important foundations for surface wave controllers in the future.