When a liquid droplet impacts a superhydrophobic surface with anisotropic surface patterning in the form of alternating ribs and cavities, the rebounding droplet may exhibit a unique two-pronged jet emission. Droplet impact experiments with eleven different fluids of viscosity that varied by more than three orders of magnitude were conducted, and this paper quantifies the Capillary number, Ca, and Ohnesorge number, Oh, ranges over which the two-pronged phenomenon occurs. For Oh > 0.0154, the behavior was never observed, while at lower values of Oh, the behavior occurs for an intermediate range of Ca that depends on Oh.
- Fluids Engineering Division
Two-Pronged Jet Formation Caused by Droplet Impact on Anisotropic Superhydrophobic Surfaces
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Pearson, JT, Maynes, D, Bilodeau, D, & Webb, BW. "Two-Pronged Jet Formation Caused by Droplet Impact on Anisotropic Superhydrophobic Surfaces." Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting. Volume 1B, Symposia: Fluid Machinery; Fluid Power; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Flow Manipulation and Active Control: Theory, Experiments and Implementation; Fundamental Issues and Perspectives in Fluid Mechanics. Incline Village, Nevada, USA. July 7–11, 2013. V01BT16A010. ASME. https://doi.org/10.1115/FEDSM2013-16629
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