68th Annual Meeting of the APS Division of Fluid Dynamics (November 22, 2015 — November 24, 2015)

P0001: Star Shaped Drops

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Authors

• S.M. Hasheminasab, Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, Iran
• Saman Lak, Physics Department, National Organization for Development of Exceptional Talents, Tehran, Iran
• M. Amin Tajik, Physics Department, National Organization for Development of Exceptional Talents, Tehran, Iran

DOI: https://doi.org/10.1103/APS.DFD.2015.GFM.P0001

Cymatics is the art of visualizing sound and vibration. In addition, it is the science of material deformation due to oscillation. Low viscous fluids can properly visualize the vibration. When a sessile water droplet is oscillated vertically, capillary-gravity waves appear on its surface and various phenomena such as deforming, bouncing and dividing occur in different vibrational conditions. In specific frequencies and amplitudes, standing waves transform the droplet into regular polygons and star shapes. These photos taken with macro photography technique, show different resonant modes of the water droplets lying on a hydrophobic substrate and subjected to a low amplitude periodic acceleration. This spectacular collection of star shaped droplets is formed when water drops with a volume ranging from 3 ml to 8 ml are forced to oscillate with frequencies in the range of 10 Hz to 80 Hz.