<i>Advances in Applied Mechanics, Vol. 6</i>

Dryden, Hugh L.; Kármán, Th. von; Kuerti, G.; Dungen, F. H. van den; Howarth, L.; Pérès, J.; Street, R. E.

doi:10.1063/1.3058022

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“…To optimize the removal rate of the single sweeper, it was necessary to introduce a more complex flow. The most common flow with intriguing complexity in nature was Karman vortex street, i.e., the fluid flowing past a cylinder resulted in shedding vortices that could be found at all scales of fluid motion [18] (Figure S9, Supporting Information). In our hydrodynamic platform, we added a cylinder at the outlet of the water flow to produce alternating vortices (Figure 4a; Figure S2d, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Active Self‐Cleaning Surfaces via Filament‐Like Sweepers Array

Yan

Chen

et al. 2023

Advanced Materials

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Hydrodynamic forces from moving fluids can be utilized to remove contaminants which is an ideal fouling-release strategy for underwater surfaces. However, the hydrodynamic forces in the viscous sublayer are greatly reduced owing to the no-slip condition, which restricts their practical applications. Here, inspired by sweeper tentacles of corals, an active self-cleaning surface with flexible filament-like sweepers are reported. The sweepers can penetrate the viscous sublayer by utilizing energy from outer turbulent flows and remove contaminants with adhesion strength of >30 kPa. Under an oscillating flow, the removal rate of the single sweeper can reach up to 99.5% due to dynamic buckling movements. In addition, the sweepers array can completely clean its coverage area within 10 s through coordinated movements as symplectic waves. The active self-cleaning surface depends on the fluid-structure coupling between sweepers and flows, which breaks the concept of conventional self-cleaning.

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Section: Resultsmentioning

confidence: 99%