CNCS Seminar
Tuesday, March 24, 2015, 2:50pm, 119 Physics
Daphne Klotsa (University of Cambridge)
Pattern formation in oscillatory fluid flows and swimming
Abstract:- Rigid spherical particles in oscillating fluid flows form
interesting structures as a result of fluid mediated
interactions. Here we show that two spheres under horizontal vibration
align themselves at right angles to the oscillation and sit with a gap
between them, which scales in a non-classical way with the boundary
layer thickness. The details of this behavior have been investigated
through experiments and simulations. We then look at a collection of
spherical particles, which form chains perpendicular to the direction
of oscillation. Comparing experiments and simulations we study the
stages of evolution from a dispersed initial configuration to an
ordered chain structure. We investigate the details of the
interactions and find that the nonlinear hydrodynamic effect of steady
streaming is the driving force. As a further application, we design
simple swimmers (self-propelled particles) that utilize steady
streaming in order to propel themselves and discuss the nature of the
transition of the onset of swimming as the Reynolds number gradually
increases.
Generated at 5:45am Saturday, April 20, 2024 by Mcal. Top
* Reload
* Login