Design and implementation of rheological metamaterials from hydrodynamic perspective
발표자
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초록
내용
Metamaterials engineered based on transformation optics have facilitated inaccessible manipulation of various physical phenomena. However, such metamaterials have not been introduced for rheology of dealing with flowing viscous matters. Here we propose a hydrodynamic metamaterial cloak that can conceal an object in two-dimensional creeping fluid flow by guiding viscous forces. Coordinate transformation of fluidic space is implemented to calculate a tensoric viscosity based on a form invariance of the Navier-Stokes equations. The hydrodynamic cloak with the viscosity tensor is numerically simulated to verify a fictitious fluidic empty space created in it. The corresponding metamaterial microstructure is systemically designed and fabricated in a microfluidic device. The experimental results reveal that a solid object amid the flow can be hydrodynamically hidden without entailing a disturbance in flow fields and experiencing a hydrodynamic drag.