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PLV: Plenarvorträge

PLV IX

PLV IX: Plenarvortrag

Mittwoch, 14. März 2018, 14:00–14:45, H 0104

Hairy Hydrodynamics — •Anette Hosoi — Massachusetts Institute of Technology, Cambridge, MA, USA

Flexible slender structures in flow are everywhere. While a great deal is known about individual flexible fibers interacting with fluids, considerably less work has been done on fiber ensembles - such as fur or hair - in flow. These hairy surfaces are abundant in nature and perform multiple functions from thermal regulation to water harvesting to sensing. Motivated by these biological systems, we consider three examples of hairy surfaces interacting with flow. In the first example, we take inspiration from semi-aquatic mammals which have specially adapted fur that serves as an effective insulator both above and below water. Many of these animals have evolved pelts that naturally entrap air when they dive. Here we investigate diving conditions and fur properties which amplify air entrainment. In the second example we consider viscous dipping, a feeding method utilized by many nectar drinking animals, whereby fluid is viscously entrained on the surface of a tongue. Finally, we consider a fundamental component in hydraulic systems, the flow rectifier. In particular we propose a design that allows the operator to modulate the relative resistances in the rectifier and that can be achieved using only solid state components.