Guang Yang, Visakh Vaikuntanathan, Alexandros Terzis, Bernhard Weigand, and Rainer Helmig from the University of Stuttgart submitted an explanatory video about the “Impact of a linear array of hydrophilic and super hydrophobic spheres on water pool” at the Gallery of Fluid Motion. This video – as well as other explanatory videos – were presented at the 71th Annual Meeting of the APS Division of Fluid Dynamics (18th November – 20th November 2018) in Atlanta.
About the explanatory film
It is quite well known that by altering the surface wetting characteristics of a solid sphere impacting on a deep water pool, the formation and evolution of underwater cavity in its wake can be controlled. The video shows the results from a preliminary study on impact of a linear array of hydrophilic (H) and super hydrophobic (SH) spheres on a deep-water pool. The current study is aimed at introducing an additional parameter, namely the position of the first SH sphere in the array, in governing the evolution of underwater cavity. The researchers show that as the first SH sphere is placed farther away from the leading edge of the array, the cavity formation becomes less pronounced. In addition, they show that the wake cavity behind the trailing edge of the linear array can be controlled by tuning the wetting characteristics of the leading and trailing surfaces in the array.
Authors
- Guang Yang, Institute of Aerospace Thermodynamics, University of Stuttgart
- Visakh Vaikuntanathan, Institute of Aerospace Thermodynamics, University of Stuttgart
- Alexandros Terzis, Institute of Aerospace Thermodynamics, University of Stuttgart
- Bernhard Weigand, Institute of Aerospace Thermodynamics, University of Stuttgart
- Rainer Helmig, Institute for Modelling Hydraulic and Environmental Systems, University of Stuttgart